Garmin GNC 420(A) manual

G NC 420(A) Pilot’ s Guide and Reference[...]

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GNC 420(A) Pilot’ s Guide and Reference i RECORD OF REVISIONS Revision Date of Revision Description A 7/99 Initial Release B 8/00 Revised and Redrawn C 5/03 Added FDE Section, update for SW 4.0 D 8/06 Changed to 8 inch x 8.5 inch format. Added TERRAIN , TIS , W eather interface info , and misc. changes E 9/06 Corrected print spec, added Data Fiel[...]

GNC 420(A) Pilot’ s Guide and Reference ii COPYRIGHT Copyright © 2009 Garmin Ltd. or its subsidiaries . All rights reserved. T his manual reflects the oper ation of Main System Software version 5.03 or later . Some differences may be observed when comparing the information in this manual to other software versions . Garmin International, Inc., [...]

GNC 420(A) Pilot’ s Guide and Reference iii T ABLE OF CONTENTS 190-00140-20 Rev . K SECTION 1: INTRODUCTION ........................................... 1-1 1.1 Accessories and Packing List ................................. 1-1 1.2 K ey and Knob Functions ......................................... 1-2 1.3 T akeoff T our ............................[...]

GNC 420(A) Pilot’ s Guide and Reference iv W ARNINGS, CAUTIONS, AND NOTES W ARNING: Navigation and terrain separation must NO T be predicated upon the use of the TERRAIN function. T he TERRAIN feature is NO T intended to be used as a primary reference for terrain avoidance and does not relieve the pilot from the responsibility of being aware of s[...]

GNC 420(A) Pilot’ s Guide and Reference v W ARNINGS, CAUTIONS, AND NOTES W ARNING: Use the GNC 420, Weather Data Link Interface , TIS , and TERRAIN at your own risk. T o reduce the risk of unsafe operation, carefully review and understand all aspects of the GNC 420 Pilot’ s Guide documenta- tion and the Flight Manual Supplement. T horoughly pra[...]

GNC 420(A) Pilot’ s Guide and Reference vi W ARRANTY A VIA TION LIMITED WARRANTY All Garmin avionics products are w arranted to be free from defects in materials or workmanship for: two years from the date of purchase for new Remote-Mount and P anel-Mount products; one year from the date of purchase for new portable products and any purchased new[...]

GNC 420(A) Pilot’ s Guide and Reference 1-1 SECTION 1 INTRODUCTION 190-00140-20 Rev . K SECTION 1: INTRODUCTION 1.1 ACCESSORIES AND P ACKING LIST Congratulations on choosing the finest, most advanced panel mount IFR navigation/communication system available. The GNC 420 represents Garmin’ s commitment to provide accurate, easy-to-use avionics.[...]

GNC 420(A) Pilot’ s Guide and Reference 1-2 SECTION 1 INTRODUCTION 190-00140-20 Rev . K 1.2 KEY AND KNOB FUNCTIONS The GNC 420 is designed to make operation as simple as possible. The key and knob descriptions (Figure 1-1) provide a general overview of the primary function(s) for each key and knob. The takeoff tour (Section 1.3) is intended to pr[...]

GNC 420(A) Pilot’ s Guide and Reference 1-3 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Left-hand K eys and Knobs (1) COM Power/V olume Knob – Controls unit power and communications radio volume. Pr ess momentarily to disable automatic squelch control. (2) COM Flip-flop Key – Used to swap the active and standby COM frequencies. Press and hol[...]

GNC 420(A) Pilot’ s Guide and Reference 1-4 SECTION 1 INTRODUCTION 190-00140-20 Rev . K NO TE: Data is entered using the large and small right knobs (Figure 1-2). Experiment with them to become efficient at entering data. T his will greatly reduce the amount of time spent operating the GNC 420 in flight. Figure 1-2 Blank Direct-to P age NO TE: [...]

GNC 420(A) Pilot’ s Guide and Reference 1-5 SECTION 1 INTRODUCTION 190-00140-20 Rev . K 1.3 T AKEOFF T OUR Overview The Garmin GNC 420 provides the pilot accurate navigational data and communication capability , along with non-precision and precision approach certification in the IFR environment. The takeoff tour is designed to familiarize the p[...]

GNC 420(A) Pilot’ s Guide and Reference 1-6 SECTION 1 INTRODUCTION 190-00140-20 Rev . K The Database V ersions Page (Figure 1-5) appears next, which shows the current database information on the NavData Card and T errain Data cards. Database information highlighted in yellow indicates the database is not within its effective dates. The NavData da[...]

GNC 420(A) Pilot’ s Guide and Reference 1-7 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Figure 1-7 Fuel Flow Selected The Instrument Panel Self-test Page includes selections to set fuel on board (FOB) to full capacity and access the Checklists Page. This allows the pilot to quickly set fuel to full limits and display any checklists that have been[...]

GNC 420(A) Pilot’ s Guide and Reference 1-8 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Satellite Status Page The Satellite Status Page (Figure 1-10) appears as the GNC 420 attempts to collect satellite information. An ‘Acquiring’ status is displayed on the Satellite Status Page, and the signal strengths of any satellites received appear as ?[...]

GNC 420(A) Pilot’ s Guide and Reference 1-9 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Selecting COM Frequencies While the GNC 420 is acquiring a position, take a minute to dial in the active and standby frequencies to be used for the rst phase of the ight. The GNC 420’ s display (Figure 1-12) is divided into separate windows (or screen [...]

GNC 420(A) Pilot’ s Guide and Reference 1-10 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Page Gr oups Page Gr oups NA V Group WPT Group A UX Group NRST Group see Section 3 see Section 7 see Section 9 see Section 8 T able 1-1 P age Groups The bottom right corner of the screen (Figure 1-14) indicates which page group (T able 1-1) is currently being[...]

GNC 420(A) Pilot’ s Guide and Reference 1-11 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Map Page After the GNC 420 acquires satellites and computes a position, the Map Page (Figure 1-15) appears automatically . Figure 1-15 Map P age Pr esent Position Desir ed T rack Data Fields Map Range Map Display The Map Page displays the present position (us[...]

GNC 420(A) Pilot’ s Guide and Reference 1-12 SECTION 1 INTRODUCTION 190-00140-20 Rev . K 5) Press the ENT K ey to confirm the identifier . T he ‘ Activate?’ function field is highlighted (Figure 1-17). Figure 1-17 ‘ Activate?’ Highlighted 6) Press the ENT K ey to activ ate a direct -to course to the selected destination. Once a dir ect[...]

GNC 420(A) Pilot’ s Guide and Reference 1-13 SECTION 1 INTRODUCTION 190-00140-20 Rev . K NA V/COM Page From the Default NA V Page, turn the small right knob until the NA V/COM Page (Figure 1-21) is displayed. Fr equency T ype Departur e, Enr oute, or Arrival Airport Fr equency List Figure 1-21 NA V/COM P age The NA V/COM Page displays the availab[...]

GNC 420(A) Pilot’ s Guide and Reference 1-14 SECTION 1 INTRODUCTION 190-00140-20 Rev . K IFR Procedur es Once the dir ect-to or ight plan is conrmed, the whole range of instrument procedur es is available to the pilot. Departures (SIDs), arrivals (ST ARs), and non-precision and precision appr oaches are stored within the NavData Card and ar[...]

GNC 420(A) Pilot’ s Guide and Reference 1-15 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Nearest (NRST) P ages The NRST Page Group pr ovides detailed information on the nine nearest airports, VORs, NDBs, intersections, and user -created waypoints within 200 nm of the current position. In addition, pages are also pr ovided to display the ve nea[...]

GNC 420(A) Pilot’ s Guide and Reference 1-16 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Viewing additional information for a nearby airport: 1) Press the small right knob to activate the cursor . 2) T urn the large right knob to select the desired airport from the list. 3) Press the ENT K ey to display waypoint (WPT) information pages for the se[...]

GNC 420(A) Pilot’ s Guide and Reference 1-17 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Nearest (NRST) Airspace P age The last page in the NRST Page Group, the Nearest Airspace Page (Figure 1-29), pr ovides information for up to nine controlled or special-use airspaces near or in the ight path. Airspace information appears on this page based [...]

GNC 420(A) Pilot’ s Guide and Reference 1-18 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Flight Plans (FPL) The GNC 420 lets the pilot create up to 20 ight plans, with up to 31 waypoints in each ight plan. Flight plans are cr eated, edited, and activated using the FPL Key . The FPL Page Group includes two pages: the Active Flight Plan Page [...]

GNC 420(A) Pilot’ s Guide and Reference 1-19 SECTION 1 INTRODUCTION 190-00140-20 Rev . K 7) Re peat st eps 5 and 6 un til al l w aypoint s for the flight plan have been entered (Figure 1-34). Figure 1-34 Enter Flight Plan W aypoints Once the ight plan is created, it may be activated fr om the Flight Plan Catalog Page Menu. Activating the i[...]

GNC 420(A) Pilot’ s Guide and Reference 1-20 SECTION 1 INTRODUCTION 190-00140-20 Rev . K Blank P age[...]

GNC 420(A) Pilot’ s Guide and Reference 2-1 SECTION 2 COM 190-00140-20 Rev . K SECTION 2: COM 2.1 COMMUNICA TING USING THE GNC 420 The GNC 420 features a digitally-tuned VHF COM radio that provides a seamless transition from communication to navigation, bringing the two most important functions in ying together in one panel-mounted unit. The G[...]

GNC 420(A) Pilot’ s Guide and Reference 2-2 SECTION 2 COM 190-00140-20 Rev . K While receiving a station, an ‘RX’ indication (Figure 2-1) appears in the upper right corner of the COM Window to the immediate right of ‘COM’. A ‘TX’ indication appears at this location when transmitting (Figure 2-2). ‘TX’ T ransmit Indication Figure 2[...]

GNC 420(A) Pilot’ s Guide and Reference 2-3 SECTION 2 COM 190-00140-20 Rev . K Auto-T uning The GNC 420’ s auto-tune feature allows the pilot to quickly select any database fr equency in the GPS Window as the standby frequency . Any COM frequency displayed in the GPS W indow can be transferred to the standby COM frequency eld, with a minimum[...]

GNC 420(A) Pilot’ s Guide and Reference 2-4 SECTION 2 COM 190-00140-20 Rev . K Selecting a COM frequency for a nearby flight service station (FSS) or center (AR TCC): 1) T urn the large right knob to select the NRST P age Group . 2) T urn the small right knob to select the Nearest Center or Nearest Flight Service Page (Figure 2-7). Figure 2-7 Ne[...]

GNC 420(A) Pilot’ s Guide and Reference 2-5 SECTION 2 COM 190-00140-20 Rev . K Selecting a COM frequency for any airport in the database: 1) T urn the large right knob to select the WPT P age Group . 2) T urn the small right knob to select the Airport F requencies P age (Figure 2-9). Figure 2-9 Airport Frequencies P age 3) Press the small right k[...]

GNC 420(A) Pilot’ s Guide and Reference 2-6 SECTION 2 COM Stuck Microphone As mentioned previously in this section, when the GNC 420 is transmitting, a ‘TX’ indication appears in the COM W indow . If the microphone key is stuck, or accidentally left in the on position, or the microphone continues to transmit after the key is released; the COM[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-1 190-00140-20 Rev . K SECTION 3: NA V P A GES 3.1 MAIN P A GE GROUPS The GNC 420’ s main pages are divided into four separate page groups: NA V , WPT , AUX, and NRST (T able 3-1). Each page group is comprised of multiple pages. The page gr oups are selected using the large right k[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-2 190-00140-20 Rev . K 3.2 NA V P A GE GROUP The NA V Page Group includes seven pages (Figure 3-2). While viewing any NA V page, turn the small right knob to select a dif ferent NA V page. The pilot may find this selection process convenient to cycle between the Default NA V Page an[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-3 190-00140-20 Rev . K NO TE: T he GNC 420 always navigates T O a waypoint unless the OBS switch is set (preventing automatic waypoint sequencing), or the aircraft has passed the last waypoint in the flight plan. Directly below the CDI appears the active leg of the ight plan, or [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-4 190-00140-20 Rev . K Selecting a different data item for any data field: 1) Starting with the Default NA V P age, press the MENU K ey to display the Default NA V P age Menu (Figure 3-4). Figure 3-4 Default NA V P age Menu 2 ) T he ‘Change Fields?’ option is already highlighted[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-5 190-00140-20 Rev . K Restoring F actory Settings All data eld settings can be quickly retur ned to their original factory settings. Restoring all six data fields to factory default settings: 1) F rom the Default NA V P age, press the MENU K ey to display the Default NA V P age [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-6 190-00140-20 Rev . K The symbols in T able 3-3 are used to depict the various airports and NA V AIDs on the Map Page. Symbol Description Airport with hard surface runway(s); (primary runway shown) Airport with soft surface runway(s) only Private Airfield Heliport VOR VOR/DME DME L[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-7 190-00140-20 Rev . K The ‘Setup Map?’ option (described in Section 3.4) allows the pilot to dene the maximum range at which each map feature appears. This provides the pilot with complete control to minimize screen clutter . The pilot can also quickly remove items from the m[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-8 190-00140-20 Rev . K When the target pointer is placed on an object, the name of that object is highlighted (even if the name wasn’ t originally displayed on the map). This feature applies to airports, NA V AIDs, user -created waypoints, roads, lakes, rivers, almost everything di[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-9 190-00140-20 Rev . K Airspace Information on the Map When a special-use or controlled airspace boundary appears on the Map Display , the pilot can quickly retrieve information (such as oor/ceiling limits and controlling agency) directly fr om the map. Viewing air space informati[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-10 190-00140-20 Rev . K Map Setup Many of the GNC 420’ s functions are menu driven. Each of the main pages has an options menu, allowing customization of the page to the pilot’ s preferences and/or selection of special featur es which specifically relate to that page. A Map Page[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-11 190-00140-20 Rev . K Changing map orientation: 1) From the Map Page Menu, turn the large right knob to highlight ‘Setup Map?’ (Figure 3-16) and press the ENT K ey . 2) T urn the small right knob to select ‘Map’ (Figure 3-17) and press the ENT K ey . Figure 3-17 Map Setup W[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-12 190-00140-20 Rev . K Automatic Zoom The automatic zoom feature automatically adjusts the map range from 2000 nm through each lower range, stopping at 1.0 nm when approaching the destination waypoint. Enabling/disabling automatic zoom: 1) F rom the Map P age Menu, turn the large ri[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-13 190-00140-20 Rev . K Displaying airspace boundaries , highways , roads , railroad lines , track log data, active flight plan course lines , and lat/long grid lines: 1) F rom the Map P age Menu, turn the large right knob to highlight ‘Setup Map?’ and press the ENT K ey . 2 ) T[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-14 190-00140-20 Rev . K T urning the data fields off/on: T urn the large right knob to highlight ‘Data Fields Off?’ (or ‘Data Fields On?’) and press the ENT K ey . Selecting Desired On-Scr een Data ‘Change Fields?’ allows the pilot to choose the data displayed on the fou[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-15 190-00140-20 Rev . K 3.5 TERRAIN P AGE NO TE: T he TERRAIN P age does not appear on GNC 420 units that are not properly equipped with or configured for TERRAIN . See Section 9 for a full description of TERRAIN functions . TERRAIN Page T o display the TERRAIN Page, select the NA V[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-16 190-00140-20 Rev . K T o display a 360˚ view: 1) Select the TERRAIN P age and press the MENU K ey . 2) Select ‘View 360˚?’ (Figure 3-28). Figure 3-28 TERRAIN P age Menu 3) Press the ENT Key . T o switch back to a 120˚ view , repeat step 1, select ‘View 120˚?, and press t[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-17 190-00140-20 Rev . K Inhibit Mode TERRAIN has an inhibit mode that deactivates the FL T A/PDA visual alerts. Pilots should use discretion when inhibiting TERRAIN and always remember to enable the system when appropriate. See Section 10.3 for more information on TERRAIN alerts. T o[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-18 190-00140-20 Rev . K 3.6 NA V/COM P A GE The NA V/COM (navigation communications) Page (Figure 3-34) pr ovides a list of the airport communication and navigation frequencies at the departure, enroute, and arrival airports. The NA V/COM Page makes selection of the frequencies neede[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-19 190-00140-20 Rev . K Scrolling through the list of fr equencies: 1) Activ ate the cursor , if not already active , by pressing the small right knob . 2) T urn the large right knob to move the cursor through the list of frequencies. If there are more frequencies in the list than ca[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-20 190-00140-20 Rev . K 3.7 POSITION P A GE The Position Page displays the present position (by default, in latitude and longitude) and altitude. The Position Page (Figure 3-39) also displays the current track, gr ound speed, time, and a r eference waypoint field. These fields are [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-21 190-00140-20 Rev . K 5) Press the ENT K ey to select the desired data item and return to the P osition P age. 6) Press the small right knob momentarily to remove the cursor from the page . The Position Page also features a reference waypoint field, located at the bottom of the pa[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-22 190-00140-20 Rev . K 6) Press the ENT K ey to select the desired type and return to the P osition P age. 7) T o select between ‘bearing FROM’ or ‘bearing T O’ to the reference waypoint, turn the small right knob to select the desired bearing reference (Figure 3-45) and pre[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-23 190-00140-20 Rev . K 3.8 SA TELLITE ST A TUS P AGE The Satellite Status Page provides a visual reference of GPS receiver functions, including current satellite coverage, GPS receiver status, and position accuracy . The Satellite Status Page (Figure 3-47) is helpful in troubleshoot[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-24 190-00140-20 Rev . K Each satellite has a 30-second data transmission that must be collected (hollow signal strength bar , see Figure 3-48) before the satellite may be used for navigation (solid signal strength bar , see Figure 3-47). Once the GPS receiver has determined the curr [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-25 190-00140-20 Rev . K 3.9 VERTICAL NA VIGA TION P A GE The GNC 420’ s V ertical Navigation Page (the last NA V page, see Figure 3-49) allows the pilot to create a three-dimensional pr ofile which guides the pilot from the present position and altitude to a nal (target) altitu[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-26 190-00140-20 Rev . K 4) T urn the small right knob to select ‘ Above Wpt’ (AGL) or ‘MSL ’, (Figure 3-52) and press the ENT K ey . ‘ Above Wpt’ uses the altitude of a destination airport as stored in the Jeppesen NavData Card. ‘MSL ’ lets the pilot set a specific t[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-27 190-00140-20 Rev . K W ith the prole set, the vertical speed required (VSR) is displayed on the V ertical Navigation Page. Expect the following to occur when using the vertical navigation feature: • At one minute prior to reaching the initial descent point, a message ‘Appro[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 3 NA V P AGES 3-28 Blank P age 190-00140-20 Rev . K[...]

GNC 420(A) Pilot’ s Guide and Reference 4-1 SECTION 4 DIRECT -TO NA VIGA TION 190-00140-20 Rev . K SECTION 4: DIRECT -TO NA VIGA TION 4.1 O VERVIEW The GNC 420’ s direct-to function provides a quick method of setting a course to a destination waypoint. Once a direct-to is activated, the GNC 420 establishes a point-to-point course line (great ci[...]

GNC 420(A) Pilot’ s Guide and Reference 4-2 SECTION 4 DIRECT -TO NA VIGA TION 190-00140-20 Rev . K Selecting a Destination by F acility Name or City In addition to selecting a destination by identifier , the Select Dir ect-to W aypoint Page (Figure 4-4) also allows the pilot to select airports, VORs, and NDBs by facility name or city location. I[...]

GNC 420(A) Pilot’ s Guide and Reference 4-3 SECTION 4 DIRECT -TO NA VIGA TION 190-00140-20 Rev . K Selecting a direct-to destination from the active flight plan: 1) Press the Direct-to K ey . T he Select Direct-to W aypoint P age appears, with the waypoint identifier field highlighted. 2) T urn the large right knob to highlight the flight pla[...]

GNC 420(A) Pilot’ s Guide and Reference 4-4 SECTION 4 DIRECT -TO NA VIGA TION 190-00140-20 Rev . K Shortcuts Shortcuts are available when using the Direct-to Key , allowing the pilot to bypass the use of the small and lar ge right knobs to enter the destination waypoint’ s identifier . A direct-to can be performed from any page displaying a si[...]

GNC 420(A) Pilot’ s Guide and Reference 4-5 SECTION 4 DIRECT -TO NA VIGA TION 190-00140-20 Rev . K Selecting a Direct-to destination fr om the Map Page Direct-to destinations may also be selected from the Map Page. If no airport, NA V AID, or user waypoint exists at the desired location, a waypoint named ‘+MAP’ is automatically created at the[...]

GNC 420(A) Pilot’ s Guide and Reference 4-6 SECTION 4 DIRECT -TO NA VIGA TION 190-00140-20 Rev . K Specifying a Course to a W aypoint When performing a direct-to, the GNC 420 sets a direct great cir cle course to the selected destination. The course to the destination can also be manually defined using the ‘CRS’ course eld on the Select D[...]

GNC 420(A) Pilot’ s Guide and Reference 5-1 SECTION 5 FLIGHT PLANS SECTION 5: FLIGHT PLANS The GNC 420 lets the pilot create up to 20 differ ent ight plans, with up to 31 waypoints in each ight plan. The Flight Plan Page Group consists of two pages (Active Flight Plan Page, Figure 5-1, and Flight Plan Catalog Page, Figure 5-2), accessed by [...]

GNC 420(A) Pilot’ s Guide and Reference 5-2 SECTION 5 FLIGHT PLANS 4) A blank Flight Plan Page appears for the first empty storage location (Figure 5-4). Use the small and large right knobs to enter the identifier of the departure w aypoint and press the ENT K ey . Figure 5-4 Flight Plan P age 5) Repeat step 4 to enter the identifier for each [...]

GNC 420(A) Pilot’ s Guide and Reference 5-3 SECTION 5 FLIGHT PLANS Deleting a waypoint from an existing flight plan: 1) Press the FPL K ey and turn the small right knob to display the Flight Plan Catalog P age . 2) Press the small right knob to activate the cursor . 3) T urn the large right knob to highlight the desired flight plan and press th[...]

GNC 420(A) Pilot’ s Guide and Reference 5-4 SECTION 5 FLIGHT PLANS Activating Flight Plans Once a ight plan is dened through the Flight Plan Catalog Page (using the steps outlined previously in this section), it may be activated for navigation. Activating the ight plan places it into ‘ight plan 00’ and overwrites any previous info[...]

GNC 420(A) Pilot’ s Guide and Reference 5-5 SECTION 5 FLIGHT PLANS Copying Flight Plans T o save a ight plan currently located in ‘ight plan 00’, be sure to copy it to an open catalog location (1-19) before the ight plan is cancelled, overwritten, or erased. Copying a flight plan to another flight plan catalog location: 1) F rom th[...]

GNC 420(A) Pilot’ s Guide and Reference 5-6 SECTION 5 FLIGHT PLANS Flight Plan Catalog Options The following options (some covered on the preceding pages) are available for the Flight Plan Catalog Page: • ‘Activate Flight Plan?’ - Allows the pilot to select the ight plan for navigation guidance, as described previously in this section. ?[...]

GNC 420(A) Pilot’ s Guide and Reference 5-7 SECTION 5 FLIGHT PLANS 5 ) The ‘Cross-side’ field allows the pilot to designate the sending and receiving units in a crossfill operation. T urn the large right knob to select the ‘Cross-side’ field, then turn the small right knob to select ‘T o’ or ‘From’ (Figure 5-15). Press the ENT K[...]

GNC 420(A) Pilot’ s Guide and Reference 5-8 SECTION 5 FLIGHT PLANS • ‘Sort List By Number?’/’Sort List by Comment?’ - Allows the pilot to sort numerically by the ight plan number or alphanumerically based upon the comment assigned to each ight plan. When one option is selected, the other option appears on the Flight Plan Catalog P[...]

GNC 420(A) Pilot’ s Guide and Reference 5-9 SECTION 5 FLIGHT PLANS Active Flight Plan P age Menu Options Activate Leg Activates/reactiv ates the flight plan and selects the highlighted leg as the ‘active leg’ (the leg which is currently used for navigation guidance). Crossfill Allows the pilot to transfer the active flight plan between two[...]

GNC 420(A) Pilot’ s Guide and Reference 5-10 SECTION 5 FLIGHT PLANS The data elds for DTK and DIS are user -selectable and may be changed to display cumulative distance (CUM) to each waypoint, estimated time of arrival (ET A), estimated time enroute (ETE), or enr oute safe altitude (ESA). Changing a data field on the Active Flight Plan P age:[...]

GNC 420(A) Pilot’ s Guide and Reference 5-11 SECTION 5 FLIGHT PLANS Selecting an approach for a direct-to or flight plan destination airport: 1) Choose the ‘ Select Approach?’ option from the Active Flight Plan P age Menu (Figure 5-24) and press the ENT K ey . Figure 5-24 Active Flight Plan P age Menu 2 ) A window appears listing the availab[...]

GNC 420(A) Pilot’ s Guide and Reference 5-12 SECTION 5 FLIGHT PLANS Selecting an arrival for a direct-to or flight plan destination airport: 1) Select the ‘Select Arrival?’ option from the Active Flight Plan P age Menu (Figure 5-27) and press the ENT K ey . Figure 5-27 Active Flight Plan P age Menu 2) A window appears listing the av ailable [...]

GNC 420(A) Pilot’ s Guide and Reference 5-13 SECTION 5 FLIGHT PLANS Removing an approach, arrival, or departure from the active flight plan: 1 ) Select the ‘Remove Approach?’, ‘Remove Arrival?’ or ‘Remove Departure?’ option from the Active Flight Plan P age Menu (Figure 5-30) and press the ENT K ey . Figure 5-30 Active Flight Plan P [...]

GNC 420(A) Pilot’ s Guide and Reference 5-14 SECTION 5 FLIGHT PLANS Shortcuts A number of shortcuts are available to save time when using the Active Flight Plan Page. These shortcuts speed the process of removing approaches, departures, and arrivals, and aid in selecting a specic ight plan leg for navigation guidance. On the preceding page,[...]

GNC 420(A) Pilot’ s Guide and Reference 5-15 SECTION 5 FLIGHT PLANS The ‘ Activate Leg?’ option is discussed previously in this section, which allows the pilot to specify which leg of the ight plan is used for navigation guidance. A shortcut also exists for this operation, using the Direct-to Key . Activating a specific leg of the active [...]

GNC 420(A) Pilot’ s Guide and Reference 5-16 SECTION 5 FLIGHT PLANS Blank P age 190-00140-20 Rev . K[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-1 SECTION 6: PROCEDURES 6.1 APPROA CHES , DEP ARTURES, AND ARRIV ALS The GNC 420 allows the pilot to y non-precision and precision approaches to airports with published instrument approach pr ocedures. All available appr oaches are stored on the Jeppesen NavData Car d, and are auto[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-2 5) T urn the large right knob to highlight ‘Load?’ or ‘ Activate?’ (approaches only) and press the ENT Key . ‘Load?’ adds the procedure to the flight plan without immediately using it for navigation guidance . T his allows the pilot to continue navigating the original ?[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-3 Another Procedur es Page option allows the pilot to activate the final course segment of the approach. This option assumes the pilot will receive vectors to the final approach x (F AF) and provides guidance to inter cept the nal course, before reaching the F AF . Activating [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-4 DO NOT USE FOR NA VIGA TION Figure 6-8 Sample Approach Select Destination ‘Select’ and ‘Load’ the appr oach ‘Activate’ the appr oach Approach operations on the GNC 420 typically begin with the same basic steps (refer to Figure 6-8 for the following steps): 1) Select the [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-5 The steps r equired to set up and y the approach are detailed below (refer to Figure 6-9 for the following steps): 1) Prior to departing KFDK, the destination (KL YH) is selected using the Direct-to Key o r b y creating a flight plan terminating at L ynchburg Regional. 2) W h i [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-6 Flying the Procedur e T urn Figure 6-13 Sample Approach with Procedur e T urn  DO NOT USE FOR NA VIGA TION     Refer to Figure 6-13 for the following steps: 1) W it hin 30 nm o f th e de sti nat ion ai rpo rt, th e G NC 420 switches from ‘enroute’ mode to ‘termi[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-7 Figure 6-16 W aypoint Alert 4) Fly the outbound course . 5) Appro ximately one minute after passing the F AF (L YH), the alert message ‘ST AR T PROC TRN’ appears in the lower right corner of the screen. Initiate the procedure turn at any time after receiving this alert message .[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-8 1 1 ) After crossing the F AF , the destination sequences to the MAP (‘RW03’, the runway threshold, see Figure 6-19). Fly toward the MAP . Figure 6-19 Sequence to MAP NO TE: When viewing the Map P age, note that the final course segment is displayed in magenta (the active leg o[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-9 The OBS Key is used to initiate the missed approach, as follows (refer to Figure 6-21 for the following steps): 1) Press the OBS Ke y. Th e missed approach holding point (MAHP; in this case ‘SW ARM’ intersection) is automatically offered as the destination waypoint (Figure 6-22)[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-10 Flying an Approach with a Hold Starting where the previous example left off, assume weather conditions resulted in a missed approach at L ynchbur g Regional. The pilot has decided to divert to Farmville Regional (KFVX) instead (refer to Figure 6-25 for the following steps). DO NOT [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-11 Figure 6-29 Active Flight Plan P age DO NOT USE FOR NA VIGA TION     Figure 6-30 T erminal Mode Refer to Figure 6-30 for the following steps. 7) As in the last example , within 30 nm of the airport, the GNC 420 switches from enroute to terminal mode , and the CDI sc ale[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-12 NO TE: If the pilot needs to lose extra altitude or speed by going around the holding pattern again, press the OBS K ey to manually suspend waypoint sequencing before crossing the holding waypoint the second time . If this waypoint has already been passed, re-activate the holding p[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-13 13) When approaching the F AF , a waypoint alert (‘NEXT DTK 209°’) appears in the lower right corner (Figure 6-35). Mak e any course adjustments necessary for the final course segment (F AF to MAP). Figure 6-35 Final Approach 14) Aft er cr os si ng th e F AF , the de st in at[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-14 Flying a DME Arc Approach The GPS overlay for a DME arc appr oach uses additional Jeppesen-pr ovided waypoints to define the arc. These waypoints are indicated by ‘D’ as the rst letter in the waypoint name. This is followed by three numbers which indicate the radial the way[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-15 Figure 6-40 Approach Window DO NOT USE FOR NA VIGA TION       Billard Muni (T opeka, KS) VOR or GPS Rwy 22 Figure 6-41 T erminal Mode Refer to Figure 6-41 for the following steps. 3) Within 30 nm of KT OP , the GNC 420 switches from enroute mode to terminal mode a[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-16 7) T h e nex t po in t in th e app ro ac h is an in te rm ed i at e fix, labeled ‘D025G’. When approaching this intermediate fix, a waypoint alert (‘NEXT DTK 205°’) appears in the lower right corner of the screen (Figure 6-44). As the distance to this fix approaches zer[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-17 1 0 ) After crossing the F AF , the destination sequences to the MAP (‘RW22’, the runway threshold). With the needle centered, fly toward the MAP , observing the altitude minimums dictated by the approach plate. When viewing the Map P age , note that the final course segment i[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-18 Selecting ‘VECT ORS’ from the T ransitions Window: 1 ) Select Billard Municipal (KT OP) as the destination, using the Dir ect-to K ey , or as the last waypoint in a flight plan. 2) Press the PROC Key and select the ‘VOR 22’ approach using the steps outlined in Section 6.1.[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-19 DO NOT USE FOR NA VIGA TION     Figure 6-52 T erminal Mode In this example, we’ll assume A TC vectors result in a rectangular course to intercept nal, as follows (refer to Figure 6-52 for the following steps): 1) Within 30 nm of KT OP , the GNC 420 switches from[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-20 DO NOT USE FOR NA VIGA TION      Figure 6-56 Approach Mode Refer to Figure 6-56 for the following steps. 6) At 2.0 nm from the F AF (T OP VOR), the GNC 420 switches from terminal mode to approach mode (Figure 6-57). CDI scaling is tightened from 1.0 to 0.3 nm, full s[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-21 Course Fr om Fix Flight Plan Legs Certain approach, departure, and arrival procedur es in the Jeppesen database contain course from x ight plan legs. The GNC 420 is able to load these legs into the ight plan along with the rest of the procedure data, and provide navigation[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-22 Figure 6-62 Default NA V P age Figure 6-63 Map P age 3) At 13.0 nm from the F AF , a waypoint alert (‘NEXT DTK 265°’) appears in the lower right corner of the screen. T urn to intercept the final approach course and watch for the CDI needle to begin to center . 4) When approa[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-23 Course from x to altitude legs show the specic target altitude on the Active Flight Plan Page (Figure 6-64) and the Default NA V Page (Figure 6-65). The missed approach sequence for the Palmdale VOR/DME RWY 25 approach includes a course from x to altitude leg. Figure 6-64 [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-24 3) Fly the o utbound course . T he Ma p P age depic ts the flight path ext endin g ind efini tely from PMD VOR (Figure 6-67). T he distance (DIS) on the Default NA V P age, the Map Page , and the Active Flight Plan P age increases , indicating the distance back to PMD VOR. Figure[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-25 Course fr om x to manual sequence legs appear on the Active Flight Plan Page and the Map Page with ‘man seq’ in place of a waypoint identier . An example of this type of course leg appears in the COAST AL ONE DEP AR TURE from W esteld, Massachusetts (Barnes Municipal).[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 6 PROCEDURES 6-26 3) Fly the outbound course . Once cleared to sequence to the next leg, press the OBS K ey . Confirm that ‘ SUSP’ no longer appears directly above the OBS K ey . An alert (‘NEXT DTK 186°’) appears in the lower right corner of the scre en (F igure 6-72) to prov ide g uidanc[...]

GNC 420(A) Pilot’ s Guide and Reference 7-1 SECTION 7 WPT P AGES SECTION 7: WPT P AGES 7.1 WPT P AGE GROUP Section 2 introduced the GNC 420’ s main page gr oups (T able 7-1)—NA V , WPT , AUX, NRST—and described each page in the NA V group. This second page group (WPT) provides information for the thousands of airports, VORs, NDBs, intersect[...]

GNC 420(A) Pilot’ s Guide and Reference 7-2 SECTION 7 WPT P AGES Entering a waypoint identifier: 1) Select the desired WPT page and press the small right knob to activate the cursor . 2) T urn the small right knob to select the first character of the w aypoint’ s identifier . 3) T urn the large right knob to select the next character field.[...]

GNC 420(A) Pilot’ s Guide and Reference 7-3 SECTION 7 WPT P AGES Duplicate Waypoints Once the identier , facility name, or location is entered, all six airport pages display information for the selected airport. When entering an identier , facility name, or location, the GNC 420’ s Spell’N’Find feature scrolls thr ough the database, d[...]

GNC 420(A) Pilot’ s Guide and Reference 7-4 SECTION 7 WPT P AGES 7.2 AIRPORT LOCA TION P AGE The Airport Location Page (Figure 7-8) displays the latitude, longitude, and elevation of the selected airport. The Airport Location Page also displays facility name and location, as well as fuel availability , available appr oaches, radar coverage, and a[...]

GNC 420(A) Pilot’ s Guide and Reference 7-5 SECTION 7 WPT P AGES 7.3 AIRPORT RUNWA Y P A GE The Airport Runway Page (Figur e 7-9) displays runway designations, length, surface type, and lighting for the selected airport. A map image of the runway layout and surrounding area is also displayed on the Airport Runway Page. The map image range appears[...]

GNC 420(A) Pilot’ s Guide and Reference 7-6 SECTION 7 WPT P AGES Adjusting the range of the map image: 1) Press the down arrow of the RNG Key t o display a smaller map area. 2) Press the up arrow of the RNG K ey to display a larger map area. The following descriptions and abbreviations are used on the Airport Runway Page: • T ype - Usage type: [...]

GNC 420(A) Pilot’ s Guide and Reference 7-7 SECTION 7 WPT P AGES 2) T urn the large right knob to scroll through the list , pla cing the cur sor on the desired freq uency (Figure 7-13). If there are more frequencies in the list than can be displayed on the screen, a scroll bar (Figure 7-12) along the right-hand side of the screen indicates the cu[...]

GNC 420(A) Pilot’ s Guide and Reference 7-8 SECTION 7 WPT P AGES The following descriptions and abbreviations are used on the Airport Frequency Page: • T ype - Usage type: Public, Heliport, Military , or Private • Frequency - Communication frequencies which may include restrictions: Appr oach Arrival Class B Class C CT A Departure TMA T ermin[...]

GNC 420(A) Pilot’ s Guide and Reference 7-9 SECTION 7 WPT P AGES 3) T urn the small right knob to display a window of available approaches for the selected airport (Figure 7-18). Continue turning the small right knob to select the desired approach. Figure 7-18 Approach Window 4) Press the ENT K ey . T he cursor moves to the transitions (TRANS) ?[...]

GNC 420(A) Pilot’ s Guide and Reference 7-10 SECTION 7 WPT P AGES Airport Approach P age Options The available options for the Airport Approach Page, can be displayed (Figure 7-21) by pressing the MENU Key: ‘Load into Active FPL?’ - Allows the pilot to load the selected appr oach into the active ight plan without activating it. This perfor[...]

GNC 420(A) Pilot’ s Guide and Reference 7-11 SECTION 7 WPT P AGES 7.6 AIRPORT ARRIV AL P A GE The Airport Arrival Page (Figure 7-22) shows the available Airport Standard T erminal Arrival (ST AR) procedur es for the selected airport. Where multiple transitions or runways are associated with the arrival procedur e, that information may also be dis[...]

GNC 420(A) Pilot’ s Guide and Reference 7-12 SECTION 7 WPT P AGES 7) T urn the small right knob to display a window of available runways (Figure 7-25). Continue turning th e sm all right knob to select the desired runway . ‘ ALL ’ may appear in the runway field, indicating the arrival procedure applies to all runways . F or airports with par[...]

GNC 420(A) Pilot’ s Guide and Reference 7-13 SECTION 7 WPT P AGES 7.7 AIRPORT DEP ARTURE P AGE The Airport Departure Page (Figure 7-27) shows the available Airport Standar d Instrument Departure (SID) procedur es for the selected airport. Where multiple runways or transitions are associated with the departure procedur e, that information may also[...]

GNC 420(A) Pilot’ s Guide and Reference 7-14 SECTION 7 WPT P AGES Airport Departur e Page Options The following option is available for the Airport Departure Page, by pressing the MENU Key: Load into Active FPL? allows the pilot to load the selected departure into the active ight plan. This is identical to loading a departure procedur e from t[...]

GNC 420(A) Pilot’ s Guide and Reference 7-15 SECTION 7 WPT P AGES 7.9 NDB P A GE The NDB Page displays the facility name, city , region/country , latitude, and longitude for the selected NDB (Figure 7-32). The NDB Page also displays the frequency and a weather broadcast indication (if ap p li c ab le ) . As mentioned in Section 7.1, NDBs may be s[...]

GNC 420(A) Pilot’ s Guide and Reference 7-16 SECTION 7 WPT P AGES 7.11 USER WA YPOINT P A GE In addition to the airport, VOR, NDB, and intersection information contained in the Jeppesen NavData Card, the GNC 420 allows the pilot to store up to 1,000 user - dened waypoints. The User W aypoint Page (Figure 7-34) displays the waypoint name (up to[...]

GNC 420(A) Pilot’ s Guide and Reference 7-17 SECTION 7 WPT P AGES 3) T urn the large right k nob to hig hli ght th e position field at the bottom of the page . 4) Use the small and large right knobs to enter the position coordinates for the new waypoint (Figure 7-37). Figure 7-37 Present P osition Field Selected 5) Press the ENT Key to accept th[...]

GNC 420(A) Pilot’ s Guide and Reference 7-18 SECTION 7 WPT P AGES 7) T urn the large right kn ob to hi ghli ght ‘Cr eate ?’ (Figure 7-39) and press the ENT K ey . Figure 7-39 ‘Create?’ Highlighted 8) Press the small right knob to remove the flashing cursor . Creating Refer ence W aypoints The GNC 420 allows the pilot to create a new user[...]

GNC 420(A) Pilot’ s Guide and Reference 7-19 SECTION 7 WPT P AGES 2) Press the ENT K ey to capture the position and display the User W aypoint Page (Figure 7-41). Figure 7-41 User W aypoint P age 3) A four -digit name is automatically assigned to the waypoint. T o change this name , turn the large right knob to highlight the name field, then use[...]

GNC 420(A) Pilot’ s Guide and Reference 7-20 SECTION 7 WPT P AGES Modifying a user waypoint by changing reference waypoint information: 1) With the User W aypoint P age displayed, press the small right knob to activate the cursor . 2) Use the small and large right knobs to enter the name of the desired waypoint and press the ENT K ey . 3) T urn t[...]

GNC 420(A) Pilot’ s Guide and Reference 7-21 SECTION 7 WPT P AGES User Waypoint P age Options The following User W aypoint Page options are available by pressing the MENU Key: ‘View User W aypoint List?’ displays a list of all user waypoints currently stored in memory . Viewing a list of all user waypoints: 1) F rom the User Waypoint Page , p[...]

GNC 420(A) Pilot’ s Guide and Reference 7-22 SECTION 7 WPT P AGES User Waypoint List The User W aypoint List (Figure 7-49) allows the pilot to review , modify , rename, or delete a selected user waypoint, or to delete all user waypoints currently stored in memor y . The top of the page shows the number of waypoints used and available memory . Fig[...]

GNC 420(A) Pilot’ s Guide and Reference 7-23 SECTION 7 WPT P AGES Deleting a user waypoint from the User W aypoint List: 1) Select the User W aypoint List, as described in this section. 2) T urn the large right knob to highlight the desired user waypoint. 3) Press the CLR K ey to di spl ay a ‘del ete w ay poi nt’ confirmation window (Figure [...]

GNC 420(A) Pilot’ s Guide and Reference 7-24 SECTION 7 WPT P AGES Blank P age 190-00140-20 Rev . K[...]

GNC 420(A) Pilot’ s Guide and Reference 8-1 SECTION 8 NRST P AGES SECTION 8: NRST P AGES 8.1 NRST P A GE GROUP Section 3.1 introduced the GNC 420’ s main page groups (T able 8-1)—NA V , WPT , AUX, NRST—and described each page in the NA V group. This fourth page group (NRST) pr ovides detailed information for the nine nearest airports, VORs,[...]

GNC 420(A) Pilot’ s Guide and Reference 8-2 SECTION 8 NRST P AGES Not all nine nearest airports, VORs, NDBs, intersections, or user waypoints can be displayed on the corresponding NRST page at one time. The Nearest Airport Page displays detailed information for three nearest airports, with a scroll bar along the right-hand side of the page indica[...]

GNC 420(A) Pilot’ s Guide and Reference 8-3 SECTION 8 NRST P AGES Navigating to a Nearby Waypoint The NRST pages can be used in conjunction with the GNC 420’ s direct-to function to quickly set a course to a nearby facility , and can provide navigation to the nearest airport in case of an in-ight emergency . Selecting a nearby airport, VOR, [...]

GNC 420(A) Pilot’ s Guide and Reference 8-4 SECTION 8 NRST P AGES 8.2 NEAREST AIRPORT P AGE The Nearest Airport Page displays the identier , symbol, bearing, and distance to the nine nearest airports (within 200 nm of the present position). For each airport listed, the Nearest Airport Page also indicates the best available approach, common tra[...]

GNC 420(A) Pilot’ s Guide and Reference 8-5 SECTION 8 NRST P AGES 5) Press the COM Flip-flop K ey to activate the selected frequency (Figure 8-11). Figure 8-11 Frequency Moved to Active Field 6) Press the small right knob to remove the flashing cursor . Additional communication frequencies, runway information, and more is available fr om the Ne[...]

GNC 420(A) Pilot’ s Guide and Reference 8-6 SECTION 8 NRST P AGES 8.3 NEAREST INTERSECTION P A GE The Nearest Intersection Page (Figure 8-15) displays the identifier , symbol, bearing, and distance to the nine nearest intersections (within 200 nm of the present position). T o view additional information for a nearby intersection, start from the [...]

GNC 420(A) Pilot’ s Guide and Reference 8-7 SECTION 8 NRST P AGES 8.5 NEAREST VOR P A GE The Nearest VOR Page (Figure 8-17) displays the identifier , symbol, bearing, and distance to the nine nearest VORs (within 200 nm of the present position). For each VOR listed, the nearest VOR Page also indicates the frequency of the nearby VOR for referenc[...]

GNC 420(A) Pilot’ s Guide and Reference 8-8 SECTION 8 NRST P AGES 8.7 NEAREST CENTER (ARTCC) P A GE The Nearest Center Page (Figure 8-20) displays the facility name, bearing to, and distance to the five nearest AR TCC points of communication (within 200 nm of the present position). For each ARTCC listed, the Nearest Center Page also indicates on[...]

GNC 420(A) Pilot’ s Guide and Reference 8-9 SECTION 8 NRST P AGES 8.8 NEAREST FLIGHT SERVICE ST A TION (FSS) P A GE The Nearest Flight Ser vice Station Page (Figure 8-23) displays the facility name, bearing to, and distance to the ve nearest FSS points of communication (within 200 nm of the present position). For each FSS listed, the Near - es[...]

GNC 420(A) Pilot’ s Guide and Reference 8-10 SECTION 8 NRST P AGES 5 ) Press the ENT K ey to place the selected frequency in the standby field of the COM (Figure 8-26). Figure 8-26 Frequency Moved to Standby Field 6) Press the COM Flip-flop K ey to activate the selected frequency . 7) Press the small right knob to remove the flashing cursor . [...]

GNC 420(A) Pilot’ s Guide and Reference 8-11 SECTION 8 NRST P AGES • If the aircraft has enter ed an airspace, the message ‘Inside Airspace’ appears (Figure 8-28). The Nearest Airspace Page shows ‘Inside of airspace’. Figure 8-28 Airspace Messages Note that the airspace alerts are based on three- dimensional data (latitude, longitude, a[...]

GNC 420(A) Pilot’ s Guide and Reference 8-12 SECTION 8 NRST P AGES 3) T urn the large right knob to scroll through the list, highlighting the desired airspace (Figure 8-31). Figure 8-31 Airspace Highlighted 4) Press the ENT Key to display the Airspace P age for the selected nearby airspace (Figure 8-32). Figure 8-32 Airspace P age Status and Time[...]

GNC 420(A) Pilot’ s Guide and Reference 8-13 SECTION 8 NRST P AGES 6) T o return to the Airspace P age , turn the large right knob to highlight ‘Done?’ and press the ENT K ey (or press the CLR K ey). 7) T o return to the Nearest Airspace P age , turn the large right knob to highlight ‘Done?’ and press the ENT K ey (or press the CLR K ey).[...]

GNC 420(A) Pilot’ s Guide and Reference 8-14 SECTION 8 NRST P AGES Blank P age 190-00140-20 Rev . K[...]

GNC 420(A) Pilot’ s Guide and Reference 9-1 SECTION 9 AUX P AGES SECTION 9: A UX P AGES 9.1 AUX P A GE GROUP Section 3.1 introduced the GNC 420’ s main page groups (T able 9-1)—NA V , WPT , AUX, NRST—and described each page in the NA V group. The third page group (AUX) allows the pilot to change unit settings. The AUX pages (Figure 9-1) als[...]

GNC 420(A) Pilot’ s Guide and Reference 9-2 SECTION 9 AUX P AGES 9.2 FLIGHT PLANNING P A GE The Flight Planning Page (Figure 9-4) provides access (via ‘menu options’) to E6B functions for fuel planning, trip planning, density altitude/true airspeed/winds aloft calculations, and a ‘Crossfill’ function to transfer ight plans/user waypoi[...]

GNC 420(A) Pilot’ s Guide and Reference 9-3 SECTION 9 AUX P AGES The following menu options are available: • Fuel Planning - When equipped with fuel ow (FF) and/or fuel on board (FOB) sensors, this option displays current fuel conditions along the active direct-to or ight plan. The pilot may also manually enter fuel ow , ground speed ([...]

GNC 420(A) Pilot’ s Guide and Reference 9-4 SECTION 9 AUX P AGES Flight Planning Page: Fuel Planning P erforming fuel planning operations: 1) Select ‘Fuel Planning’ from the Flight Planning P age , using the steps described in Section 9.2. 2) T he current fuel planning ‘mode’ is displayed at the top of the page (Figure 9-7): ‘POINT T O [...]

GNC 420(A) Pilot’ s Guide and Reference 9-5 SECTION 9 AUX P AGES 5) If the fuel management system does not enter the data automatically , turn the large right knob to highlight the fuel on board (FOB) field (Figure 9-11). Figure 9-11 FOB Highlighted 6) Use the small and large right knobs to enter the amount of fuel on board. Press the ENT K ey w[...]

GNC 420(A) Pilot’ s Guide and Reference 9-6 SECTION 9 AUX P AGES Fuel planning figures can be entered and displayed based upon one of three possible configurations: • No fuel sensors connected - In this instance fuel ow is manually entered and is used to calculate fuel on board. When fuel ow or fuel on boar d is manually entered, the ?[...]

GNC 420(A) Pilot’ s Guide and Reference 9-7 SECTION 9 AUX P AGES 5) T urn the large right knob to highlight the departure time (DEP TIME) field. 6) Use the small and large right knobs to enter the departure time . Press the ENT K ey when finished. Departure time may be entered in local or UTC time , depending upon unit settings , see Section 9.[...]

GNC 420(A) Pilot’ s Guide and Reference 9-8 SECTION 9 AUX P AGES 4) T he flashing cursor moves to the barometric pressure (BARO) field. Use the small and large right knobs to enter the barometric pressure (altimeter setting). Press the ENT K ey when finished. 5) T he flashing cursor moves to the total air temperature (T A T) field. Use the s[...]

GNC 420(A) Pilot’ s Guide and Reference 9-9 SECTION 9 AUX P AGES • Automatic Operation: If both units are set to automatic, a change in the active ight plan of one unit is also be seen in the other . Initiating a direct-to to a waypoint on one unit also initiates a direct-to to the same waypoint on the other unit. If one unit is set for auto[...]

GNC 420(A) Pilot’ s Guide and Reference 9-10 SECTION 9 AUX P AGES • Active Flight Plan - T ransfer the active ight plan to/from a second 400/500-series Garmin unit in a dual unit installation. This option is the default when selecting ‘ Crossll’ fr om the Active Flight Plan Page. • Flight Plan - T ransfer any stored ight plan to/[...]

GNC 420(A) Pilot’ s Guide and Reference 9-11 SECTION 9 AUX P AGES 4) T he flashing cursor moves to the type field under the new message (Figure 9-27). T urn the small right knob to display a window of available options (Figure 9-28): Event, One T ime , P eriodic. Press the ENT K ey to select. Figure 9-27 T ype Field Highlighted Figure 9-28 T yp[...]

GNC 420(A) Pilot’ s Guide and Reference 9-12 SECTION 9 AUX P AGES 9.3 UTILITY P A GE The Utility Page (Figure 9-29) provides access (via menu options) to checklists, a count down/up timer , trip timers, trip statistics, RAIM (Receiver Autonomous Integrity Monitoring) prediction, sunrise/sunset time calculations, software versions, database versio[...]

GNC 420(A) Pilot’ s Guide and Reference 9-13 SECTION 9 AUX P AGES • RAIM Prediction - Predicts if GPS coverage is available for the current location or at a specified waypoint at any time and date. Receiver Autonomous Integrity Monitoring (RAIM) performs checks to ensure that the GNC 420 will have adequate satellite geometry during the ight[...]

GNC 420(A) Pilot’ s Guide and Reference 9-14 SECTION 9 AUX P AGES Utility Page: Checklists Creating a checklist: 1) Select ‘Checklist’ from the Utility P age (Figure 9-33), using the steps described at the beginning of this section (9.3). Press the ENT K ey to display a list of checklists . Figure 9-33 Checklists Highlighted 2) Press the MENU[...]

GNC 420(A) Pilot’ s Guide and Reference 9-15 SECTION 9 AUX P AGES Inserting a checklist step into an existing checklist: 1) With the Checklists P age displayed, turn the large right knob to select the desired checklist and press the ENT K ey . 2) T urn the large right knob to highlight the existing checklist entry which immediately follows the ne[...]

GNC 420(A) Pilot’ s Guide and Reference 9-16 SECTION 9 AUX P AGES 4) F or a count down timer , turn the large right knob to highlight the time field. Use the small and large right knobs to enter the count down time—in hours , minutes , and seconds . Press the ENT K ey when finished. 5) T o stop the generic timer , turn the large right knob to[...]

GNC 420(A) Pilot’ s Guide and Reference 9-17 SECTION 9 AUX P AGES Utility Page: T rip Statistics Resetting trip statistics readouts: 1) Select ‘T rip Statistics’ from the Utility P age (Figure 9-40), using the steps described at the beginning of this section. Figure 9-40 T rip Statistics Highlighted 2 ) Press the MENU K ey to display the T ri[...]

GNC 420(A) Pilot’ s Guide and Reference 9-18 SECTION 9 AUX P AGES 3) T he flashing cursor moves to the arrival date field. Use the small and large right knobs to enter the date for which the pilot wants to determine RAIM availability . Press the ENT K ey when finished. 4) T he flashing cursor moves to the arrival time field. Use the small an[...]

GNC 420(A) Pilot’ s Guide and Reference 9-19 SECTION 9 AUX P AGES 4) Press the ENT K ey to calculate sunrise and sunset time s for the select ed location and date (Figure 9-47). Figure 9-47 Sunrise/Sunset P age Utility Page: Software V ersions The Software V ersions Page (Figure 9-48) displays software version information for each of the various [...]

GNC 420(A) Pilot’ s Guide and Reference 9-20 SECTION 9 AUX P AGES 9.4 SETUP 1 P A GE The Setup 1 Page provides access (via menu options) to airspace alarms, CDI scale adjustment, an arrival alarm, units of measure settings, position formats, map datums, and settings for local or UTC time display . When a menu option is selected, the corresponding[...]

GNC 420(A) Pilot’ s Guide and Reference 9-21 SECTION 9 AUX P AGES CDI Scales and Corr esponding Flight Phases: Oceanic Enr oute T erminal Appr oach Figure 9-54 CDI Scales During appr oach operations the CDI scale gradually ramps down even further , to 0.3 nm. This transition normally occurs within 2.0 nm of the nal approach x (F AF). If a l[...]

GNC 420(A) Pilot’ s Guide and Reference 9-22 SECTION 9 AUX P AGES • ‘Position/Map Datum’ - Congures position readout information to the desired position format. The map datum used in the GNC 420 is WGS 84. Note that using a map datum that does not match the charts can result in significant differ ences in position information. When usin[...]

GNC 420(A) Pilot’ s Guide and Reference 9-23 SECTION 9 AUX P AGES 4) T o change the altitude buffer , turn the large right knob to highlight the ‘ Altitude Buffers’ field (Figure 9-57). Use the small and large right knobs to enter the desired buffer distance . Press the ENT Key when finished. Figure 9-57 Buffer Distance Field Selected NO TE[...]

GNC 420(A) Pilot’ s Guide and Reference 9-24 SECTION 9 AUX P AGES Setting the arrival alarm and alarm distance: 1) Select ‘CDI/Alarms’ from the Setup 1 Page , using the steps described at the beginning of this section. 2) T urn the large right knob to highlight the ‘On’/’Off’ field (directly below ‘ Arrival Alarm’). 3) T urn the [...]

GNC 420(A) Pilot’ s Guide and Reference 9-25 SECTION 9 AUX P AGES Changing the units of measure: 1) Select ‘Units/Mag V ar’ from the Setup 1 P age , using the steps described at the beginning of this section. 2) T urn the large right knob to highlight the desired units of measure category (Figure 9-63). Figure 9-63 Units Mag/V ar P age The fo[...]

GNC 420(A) Pilot’ s Guide and Reference 9-26 SECTION 9 AUX P AGES Displaying the map datum: 1) Select ‘P osition Format/Map Datum’ from the Setup 1 P age, using the steps described at the beginning of this section. 2) T he WGS 84 map datum is displayed, this field cannot be changed. Figure 9-66 Map Datum Field Highlighted Setup 1 Page: Date/[...]

GNC 420(A) Pilot’ s Guide and Reference 9-27 SECTION 9 AUX P AGES Restoring F actory Settings When making changes to any Setup 1 Page option, a ‘Restore Defaults?’ menu selection allows the pilot to restore the original factory settings (for the selected option only). For example, with the Airspace Alarms Page displayed, the ‘Restore Defaul[...]

GNC 420(A) Pilot’ s Guide and Reference 9-28 SECTION 9 AUX P AGES 2) T urn the large right knob to select the desired menu option (Figure 9-71), and press the ENT K ey (Figure 9-72). Figure 9-71 Nearest Airport Criteria Highlighted Figure 9-72 Nearest Airport Criteria P age The following menu options are available: • ‘Display’ - Allows the [...]

GNC 420(A) Pilot’ s Guide and Reference 9-29 SECTION 9 AUX P AGES Setup 2 Page: Display Changing the backlighting intensity: 1) Select ‘Display’ from the Setup 2 P age (Figure 9-73), using the steps described at the beginning of this section (9.5). Figure 9-73 Display Highlighted 2) T he flashing cursor highlights the backlight mode field. [...]

GNC 420(A) Pilot’ s Guide and Reference 9-30 SECTION 9 AUX P AGES Setup 2 Page: Nearest Airport Criteria Setting the minimum runway length and runway surface: 1 ) Select ‘Nearest Airport Criteria’ from the Setup 2 P age, using the steps described at the beginning of this section. 2 ) The flashing cursor highlights the runway surface field (F[...]

GNC 420(A) Pilot’ s Guide and Reference 9-31 SECTION 9 AUX P AGES Setup 2 Page: Data Field Configuration Configuring the Data Fields: 1) Select ‘Data Field Configuration’ from the Setup 2 Page , using the steps described at the beginning of this section. T he flashing cursor highlights the data field (Figure 9-79). Figure 9-79 Upper Data [...]

GNC 420(A) Pilot’ s Guide and Reference 9-32 SECTION 9 AUX P AGES 2) T urn the small right knob to select an option from the Auxiliary Configuration Window (Figure 9-82). Figure 9-82 AUX CONFIG W indow 3) Selecting ‘Config Fields’ configures the data field to display user selectable data information. Selecting ‘T raffic’ configures t[...]

GNC 420(A) Pilot’ s Guide and Reference 10-1 SECTION 10 TERRAIN SECTION 10: TERRAIN NO TE: Not all GNC 420 units are equipped with or configured for TERRAIN . See the 400-series Installation Manual (190-00140-02) for TERRAIN configuration information. 10.1 INTRODUCTION Garmin TERRAIN is a non-TSO-C151b-certified terrain awareness system incorp[...]

GNC 420(A) Pilot’ s Guide and Reference 10-2 SECTION 10 TERRAIN TERRAIN Alerting TERRAIN uses information provided from the GPS receiver to pr ovide a horizontal position and altitude. GPS altitude is derived fr om satellite measurements. GPS altitude is converted to a mean sea level (MSL)-based altitude (GPS-MSL altitude) and is used to determin[...]

GNC 420(A) Pilot’ s Guide and Reference 10-3 SECTION 10 TERRAIN 10.2 TERRAIN P AGE See Section 3.5 for a complete description of the TERRAIN Page and its operation. TERRAIN Symbols The symbols and colors in Figure 10-1 and T able 10-1 are used to represent obstacles and potential impact points on the TERRAIN Page. TERRAIN uses yellow (caution) an[...]

GNC 420(A) Pilot’ s Guide and Reference 10-4 SECTION 10 TERRAIN 10.3 TERRAIN ALERTS TERRAIN Alerts are issued when ight conditions meet parameters that are set within TERRAIN software algorithms. TERRAIN alerts typically employ either an ADVISOR Y or a CAUTION alert severity level, or both. When an alert is issued, visual annunciations are dis[...]

GNC 420(A) Pilot’ s Guide and Reference 10-5 SECTION 10 TERRAIN T able 10-2 shows the possible TERRAIN alert types with corresponding annunciations. Alert T ype Annunciation Pop-Up Alert TERRAIN F ailure None TERRAIN Inhibited None TERRAIN Not Available None Required T errain Clear ance (R TC) Advisory Required T errain Clear ance (R TC) Caution [...]

GNC 420(A) Pilot’ s Guide and Reference 10-6 SECTION 10 TERRAIN T able 10-3 shows system status annunciations that may also be issued: Alert T ype TERRAIN P age Annunciation P op-Up Alert TERRAIN System T est F ail None TERRAIN Alerting is disabled None No GPS position or excessively degraded GPS signal None System T est in progress None System T[...]

GNC 420(A) Pilot’ s Guide and Reference 10-7 SECTION 10 TERRAIN Prematur e Descent Alerting A Premature Descent Alert (PDA) is issued when the system detects that the aircraft is significantly below the normal approach path to a runway (Figur e 10-5). PDA alerting begins when the aircraft is within 15 nm of the destination airport. PDA alerting [...]

GNC 420(A) Pilot’ s Guide and Reference 10-8 SECTION 10 TERRAIN TERRAIN NO T A V AILABLE ALER T TERRAIN requires a 3-D GPS navigation solution along with specic vertical accuracy minimums. Should the navigation solution become degraded or if the air craft is out of the database coverage area, the annunciation ‘TER N/A ’ is generated in the[...]

GNC 420(A) Pilot’ s Guide and Reference 10-9 SECTION 10 TERRAIN 10.4 DA T ABASE INFORMA TION FOR TERRAIN General Database Information Garmin TERRAIN uses terrain and obstacle information supplied by government sources. The data undergoes verification by Garmin to confirm accuracy of the content, per TSO-C151b. However , the displayed informatio[...]

GNC 420(A) Pilot’ s Guide and Reference 10-10 SECTION 10 TERRAIN Database Updates T errain/obstacle databases are updated periodically with the latest terrain and obstacle data. V isit the Garmin website to check for newer versions of terrain/obstacle databases (compare database cycle numbers to determine if a newer version is available). Updated[...]

GNC 420(A) Pilot’ s Guide and Reference 11-1 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K SECTION 11: ADDITIONAL FEA TURES CA UTION: T he Weather Data Link and TIS information contained in this section is not intended to replace the documentation that is supplied with the GDL 49, the GDL 69(A) Data Link, and the GTX 330 T ransponder . CA [...]

GNC 420(A) Pilot’ s Guide and Reference 11-2 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K TIS displays up to eight trafc tar gets within 7 nautical miles horizontally from 3000 feet below to 3500 feet above the requesting air craft (Figure 11-1). Figure 11-1 TIS Coverage V olume 7.0 nm 3,500 ft 3,000 ft Not to Scale TIS Operational Pr [...]

GNC 420(A) Pilot’ s Guide and Reference 11-3 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K comes between the transponder antenna (usually located on the underside of the aircraft) and the ground-based radar antenna, the signal may be temporarily interrupted. Other limitations and anomalies associated with TIS are described in the AIM, Sect[...]

GNC 420(A) Pilot’ s Guide and Reference 11-4 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K TIS Audio Alerting The TIS audio alert is generated when the number of T rafc Advisories (T A) on the GNC 420 display increases from one scan to the next. For example, when the rst T A appears on the TIS display , the user is alerted audibly . [...]

GNC 420(A) Pilot’ s Guide and Reference 11-5 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Figure 11-4 T raffic Symbol Components Altitude Deviation Altitude T rend T raffic Ground T rack V ector T raffic T ype T raffic T ype Description T r affic Advisory (T A) T his symbol (solid yellow circle) is gener ated when an intruder aircraf[...]

GNC 420(A) Pilot’ s Guide and Reference 11-6 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K • DA T A F AIL - ‘DA T A F AIL ’ is displayed when data is being received fr om GTX 330 (Figure 11-7), but there was a failure detected in the data str eam. The pilot should see the installer for corrective action. Figure 11-7 ‘Data F ail’ [...]

GNC 420(A) Pilot’ s Guide and Reference 11-7 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Figure 11-11 T raffic Removed Banner • UNA V AIL - When a 60 second period elapses with no data, TIS is considered to be unavailable. This state is indicated by the text ‘UNA V AIL ’ (Figure 11-12). The pilot should be aware that ‘UNA V AIL [...]

GNC 420(A) Pilot’ s Guide and Reference 11-8 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K T raffic P age Display Range V arious display ranges can be selected for optimal display of TIS trafc information. Changing the display range on the T raffic P age: Press the RNG K ey to zoom through the range selections which are: 12/6 nm, 6/2 [...]

GNC 420(A) Pilot’ s Guide and Reference 11-9 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Thumbnail T raffic on Map Page The Map Page can display trafc in a thumbnail format in any of the top three data fields on the right-hand side of the Map Page. Displaying Thumbnail T r affic on the Map P age: 1) T urn the small right knob to se[...]

GNC 420(A) Pilot’ s Guide and Reference 11-10 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Power -Up T est The TIS interface performs an automatic test during power -up. • If the system passes the power -up test, the Standby Screen appears on the T rafc Page. • If the system passes the power -up test and the aircraft is airborne (a[...]

GNC 420(A) Pilot’ s Guide and Reference 11-11 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K 11.2 GTS 8XX TRAFFIC SYSTEMS Introduction All information in this section pertains to the display and control of the Garmin GNC 420/GTS 8XX interface, refer to the 400/500 Series Display Interfaces Pilot’ s Guide Addendum (190-00140-10) when inter[...]

GNC 420(A) Pilot’ s Guide and Reference 11-12 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Pilots should be aware of T AS/TCAS system limitations. If an intruder transponder does not respond to interrogations due to antenna shading or marginal transponder performance, it will not be displayed, or display may be intermittent. Pilots should[...]

GNC 420(A) Pilot’ s Guide and Reference 11-13 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Aural Alerts A T A consists of a displayed trafc symbol (solid yellow circle) and an aural alert. The aural alert announces “traffic”, followed by the intruder aircraft’ s position, altitude relative to own aircraft (“high”, “low”,[...]

GNC 420(A) Pilot’ s Guide and Reference 11-14 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Switching Between Standby and Operating Modes The unit must be in operating mode for traffic to be displayed. The ability to switch out of standby into operating mode on the ground is especially useful for scanning the airspace around the airport b[...]

GNC 420(A) Pilot’ s Guide and Reference 11-15 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Altitude Display Mode The GTS 8XX has four altitude display modes (Figure 11-24); Normal (±2,700 ft), Above (-2,700 ft to +9,000 ft), Below (-9,000 ft to +2,700 ft), and Unrestricted (±9,900 ft). The GTS 8XX continues to display up to 30 intruder [...]

GNC 420(A) Pilot’ s Guide and Reference 11-16 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K T raffic W arning Window When the unit is not on the trafc page and the GTS issues a T rafc Advisory , the T rafc W ar ning Window (Figure 11-26) is displayed, which shows a small thumbnail map. When the T rafc W arning Window is displa[...]

GNC 420(A) Pilot’ s Guide and Reference 11-17 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K 10) Return to the Map P age by pressing the CLR K ey . Thumbnail T raffic on Map Page T raffic in a thumbnail format can be displayed in any of the three data elds on the right side of the Map Page (Figure 11-29). Displaying Thumbnail T r affi[...]

GNC 420(A) Pilot’ s Guide and Reference 11-18 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K 11.3 WEA THER DA T A LINK INTERF A CE This section is written for: • Garmin GNC 420 Main System Software V ersion 5.01 and later • GDL 49 Main Software V ersion 2.03 and later • GDL 69/69A Main Software V ersion 2.14 and later Some differences[...]

GNC 420(A) Pilot’ s Guide and Reference 11-19 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K W eather Products The following weather products are available for display on the GNC 420 unit via the W eather Data Link interface: • NEXRAD Data • Graphical MET AR Data • T ext-based MET AR Data • Graphical T emperatur e/Dewpoint Data • [...]

GNC 420(A) Pilot’ s Guide and Reference 11-20 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K NEXRAD Intensity Colors are used to identify the differ ent NEXRAD echo intensities (reectivity) measured in dBZ (decibels of Z). Reectivity (designated by the letter Z) is the amount of transmitted power retur ned to the radar receiver . The [...]

GNC 420(A) Pilot’ s Guide and Reference 11-21 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Requesting NEXRAD Data NEXRAD data can be requested from the Data Link Page or the Map Page. Requesting NEXRAD data from the Data Link P age: 1) Select the Data Link P age from the A UX P age Group . 2) Press the small right k nob to ac tivate th e [...]

GNC 420(A) Pilot’ s Guide and Reference 11-22 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K • Auto Request (GDL 49 Only) - This eld is used to set the time interval for the GDL 49 to automatically send a NEXRAD data request. The time options are OFF , 10 min, 15 min, 20 min, 30 min, 45 min, and 1 hour . When an auto request time is se[...]

GNC 420(A) Pilot’ s Guide and Reference 11-23 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Displaying NEXRAD Data on the Weather P age T o display NEXRAD Data on the W eather P age: 1) Select the NA V Weather P age (Figure 11-34) using the small and large right knobs . When the GNC 420 unit is configured with the Data Link interface , th[...]

GNC 420(A) Pilot’ s Guide and Reference 11-24 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Displaying NEXRAD Data on the Map Page When NEXRAD data is received, it is displayed on the Map Page, in addition to the W eather Page and the Default NA V Page. Customizing NEXRAD Data on the Map Page The pilot can customize NEXRAD data on the Map [...]

GNC 420(A) Pilot’ s Guide and Reference 11-25 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K The pilot may use the ‘NEXRAD Off?’ and ‘NEXRAD On?’ elds in the Page Menu (Figure 11-36) to tur n off the display of NEXRAD data from the Map Page. Figure 11-36 Map P age Options Menu NO TE: If the GNC 420 is configured for Weather Data [...]

GNC 420(A) Pilot’ s Guide and Reference 11-26 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Data Link Request Log Page (GDL 49 Only) The Data Link Request Log Page (Figure 11-38) is used to display the data that was r equested. When a request is received, a check mark is placed in the box. Viewing the Data Link Request Log P age: 1) Use th[...]

GNC 420(A) Pilot’ s Guide and Reference 11-27 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K • Auto Request - T his eld is used to set the time interval for the system to automatically send the position. T he time options are OFF , 10 min, 15 min, 20 min, 30 min, 45 min, and 1 hr . When an auto request time is selected, the first repor[...]

GNC 420(A) Pilot’ s Guide and Reference 11-28 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K NO TE: T extual MET ARs can only be requested by identifier or by flight plan (if the flight plan contains a MET AR station identifier). • Center - This field allows the pilot to specify reference points for the r equest. The following five [...]

GNC 420(A) Pilot’ s Guide and Reference 11-29 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Requesting graphical or textual MET ARs from the Map P age: 1) Select the Map P age . 2) Press the MENU K ey . The Map P age Options Menu is displayed (Figure 11-44). Figure 11-44 Map P age Menu 3) Select ‘Request MET AR’ and press the ENT K ey [...]

GNC 420(A) Pilot’ s Guide and Reference 11-30 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K W eather Legend Page The symbology unique to Graphical MET AR, W inds, and T emperature/Dewpoint data is displayed on the W eather Legend Page. The W eather Legend is accessed from the W eather Page. NO TE: All MET AR, Wind, and T emp-Dewpoint symbo[...]

GNC 420(A) Pilot’ s Guide and Reference 11-31 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Entering an identifier: 1) Select the Data Link P age . Highlight ‘TEXTU AL MET AR’ and press the ENT K ey . 2) T urn the small right knob and scroll through the list of four letter identifiers . 3) Highlight the desired identifier and press [...]

GNC 420(A) Pilot’ s Guide and Reference 11-32 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Monitoring the Data Link The Data Link Status Page provides an indication of the integrity of the Data Link. The Data Link Page allows the pilot to monitor the system and determine the possible cause of a failure. View the Data Link Status P age: 1)[...]

GNC 420(A) Pilot’ s Guide and Reference 11-33 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K The GDL 69 Datalink Status Page shows the following fields: • Sat ID/Connectivity - This eld shows the current activation status and signal strength of the XM Satellite Radio weather service. T able 11-10 lists the messages that may be shown i[...]

GNC 420(A) Pilot’ s Guide and Reference 11-34 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Standard Aviation F orecast Abbreviations The standard aviation forecast abbreviations are listed in T able 11-12. ST AND ARD A VIA TION FORECAST ABBREVIA TIONS ‘+’ – (Heavy) ‘-’ – (Light) ‘/’ – (Missing or separator) Axxxx – Alt[...]

GNC 420(A) Pilot’ s Guide and Reference 11-35 SECTION 11 ADDITIONAL FEA TURES 190-00140-20 Rev . K Ceiling and Visibility - Flight Rules VFR (green bars) Marginal VFR (green bars) IFR (yellow bars) Low IFR (yellow bars) T able 11-15 Ceiling and Visibility Graphics Ceiling Pr ecipitation Visibility Station Identifier Data Age Figure 11-48 MET AR [...]

GNC 420(A) Pilot’ s Guide and Reference 11-36 SECTION 11 ADDITIONAL FEA TURES T emp - Dewpoint Display Ranges (Blank) Unknown 11°+ (Green) 7° - 10° (Green) 0° - 6° (Y ellow) T able 11-18 T emp-Dewpoint Ranges This symbol in Figure 11-50 displays the differ ence between the reported temperature and dewpoint as 7-10 degrees Fahrenheit at KSPW [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 12 – F AUL T DETECTION AND EXCLUSION 12-1 SECTION 12: F A UL T DETECTION AND EXCLUSION Fault Detection and Exclusion (FDE) is incorporated in the Garmin GNC 420 main and GPS software version 3.00 and higher . FDE algorithms pr ovide a basis for approval per the requirements for “GPS as a Primary[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 12 – F AUL T DETECTION AND EXCLUSION 12-2 12.2 PRE-DEP ARTURE VERIFICA TION OF FDE Since FDE is based upon the exclusion of “bad” satellites, it is necessary to ensure ther e will be an adequate number of satellites in the GPS constellation that are still able to provide a navigation solution.[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-1 SECTION 13: MESSA GES , ABBREVIA TIONS , AND NA V TERMS 13.1 MESSA GES The GNC 420 uses a ashing ‘MSG’ annunciator at the bottom of the screen (directly above the MSG Key) to alert the pilot of any important information or warnings. While[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-2 Message Description Approaching VNA V profile T he aircr aft is within one minute of reaching the initial V ertical Navigation descent, or climb , point. Arrival at waypoint [waypoint name] T he aircr aft is within the arrival alarm circle for [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-3 Message Description COM transmitter power has been reduced T he GNC 420 has detected excessive unit temper ature and/or an insufficient voltage level. T he COM tr ansceiver transmit power has been automatically reduced to compensate for the con[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-4 Message Description FPL has been truncated T he flight plan (FPL) w as truncated because not enough room existed to insert an approach, departure , or arrival. T his message also appears when an approach has been deleted from a stored flight p[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-5 Message Description Invalid FPL modification An attempt was made to modify the final course segment (F AF to MAP) of an instrument approach. T he GNC 420 does not allow the modifications . Invalid waypoint ident An attempt w as made to create[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-6 Message Description P oor GPS coverage T he GPS receiver cannot acquire a sufficient number of satellites to compute a position and provide navigation. P ower down and re- initialize T he GNC 420 cannot calculate a position due to abnormal sate[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-7 Message Description Stored data was lost All user w aypoints , flight plans , and system settings have been lost due to a memory battery failure or system reset. T errain See Section 10.3 for complete list of TERRAIN related Alerts and Annuncia[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-8 13.2 ABBREVIA TIONS The following is a list of abbreviations used on the GNC 420 and their meanings: ACTV Active A LT Altitude APPRCHING Approaching APR Approach APT Airport ARSPC Airspace AR TCC Air Route T rafc Control Center AR VL Arrival [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-9 G/S Glideslope gl Gallons GPS Global Positioning System GS Ground Speed HDG Heading hg Inches of Mer cury HUL Horizontal Uncertainty Level HWY Highway ID Identifier ig Imperial Gallons ILS Instrument Landing System IND Indicated INT Intersectio[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-10 P .POS Present Position PROC Procedure(s) PROV Province PWR Power RAD Radial RAIM Receiver Autonomous Integrity Monitoring REF Reference REQ Required/Requirements RESTRICTD Restricted RNG Range RX Receive SID Standard Instrument Departur e Sml [...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-11 13.3 NA VIGA TION TERMS The following navigation terms are used on the GNC 420 and in this Pilot’ s Guide. Refer to Figures 13-1 and 13-2 for graphic representation of navigation terms. WPT 1 XTK NORTH WPT 2 BRG GS DIS AIRPLANE DTK TRK Figure[...]

GNC 420(A) Pilot’ s Guide and Reference SECTION 13 – MESSAGES, ABBREVIA TIONS, & NA V TERMS 13-12 T erm Description EFF (efficiency) A measure of fuel consumption, expressed in distance per fuel units (e.g., nautical miles per gallon). ENDUR (endurance) Flight endurance , or total av ailable flight time based upon available fuel. EPE (est[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX A DA T A CARD USE A-1 APPENDIX A: D A T A CARD USE The Jeppesen NavData Car d, and the T errain Data Card (if applicable) supplied with the GNC 420 can be installed or removed when the GNC 420 is on or off. If the NavData Card is not pr esent when the unit is turned on, a ‘No Jeppesen A viation D[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX A DA T A CARD USE A-2 Removing the NavData or T errain Data Card (Figure A-2): 1) Gently press on the tab—using a slight upward motion—at the front center of the data card. T his partially deploys the swing arm handle . 2) Rotate the swing arm handle upward (and outward) until it locks into pla[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX B SPECIFICA TIONS B-1 APPENDIX B: SPECIFICA TIONS PHYSICAL Unit Size: 6.25’W x 11.00’D x 2.65’H (159 mm x 279 mm x 67 mm) Unit W eight: 5.9 pounds installed (2.6 kg) POWER* Input: 28 Vdc (early 420, all 420A units) 14/28 Vdc (later 420 units) ENVIRONMENT AL T emperature: -20°C to +55°C (ope[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX B SPECIFICA TIONS B-2 Blank P age 190-00140-20 Rev . K[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX C TROUBLESHOOTING C-1 APPENDIX C: TROUBLESHOO TING Q & A This section is designed to answer some of the common questions regarding the GNC 420’ s capabilities and operation. If there is a pr oblem operating the unit, read through this appendix and refer to the reference section noted. If the [...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX C TROUBLESHOOTING C-2 What happens when I select an approach? Can I store a flight plan with an appr oach, departure , or arrival? When loading an appr oach, departure, or arrival into the active ight plan, a set of approach, departure, or arrival waypoints is inserted into the ight plan—a[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX C TROUBLESHOOTING C-3 NORMAL (no ‘OBS’ annunciator) OBS Automatic sequencing of waypoints Manual sequencing- ‘holds’ on selected waypoint Change in HSI does not affect CDI deflection Manually select course to next waypoint from HSI Always navigates ‘T O’ the active waypoint Indicates ?[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX C TROUBLESHOOTING C-4 When should I use the OBS key to return to auto sequencing, and what happens when I do? The most common application for using the OBS Key is the missed approach. The GNC 420 suspends automatic waypoint sequencing (indicated by a ‘SUSP’ annunciation directly above the OBS K[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX C TROUBLESHOOTING C-5 When does turn anticipation begin, and what bank angle is expected? The GNC 420 smooths adjacent leg transitions based upon a nominal 15º bank angle (with the ability to roll up to 25º) and provide thr ee pilot cues for turn anticipation: 1) A waypoint alert (‘NEXT DTK ###[...]

GNC 420(A) Pilot’ s Guide and Reference APPENDIX C TROUBLESHOOTING C-6 Why does my CDI not respond like a VOR when OBS mode is active? Unlike a VOR, the CDI scale used on GPS equipment is based on the cross-track distance to the desired course, not an angular r elationship to the destination (Figur e C-8). Therefore, the CDI deection on the GP[...]

GNC 420(A) Pilot’ s Guide and Reference I-1 INDEX A Abbreviations 7-4 , 7-6 , 7-8 , 7-14 , 7-15 , 7-16 , 13-8 Accessories 1-1 Activate an existing flight plan in reverse 5-4 Activate leg 5-10 , 5-15 , C-4 Activate the approach 6-4 , 6-10 , C-6 Activating flight plans 5-3 Active flight plan options 5-8 , 5-10 , 5-11 , 5-12 , 5-13 Active frequen[...]

GNC 420(A) Pilot’ s Guide and Reference I-2 INDEX Desired track 1-11 , 1-12 , 3-3 , 3-7 , 5-8 , 6-15 , 6-24 , 6-26 , 9-3 , 13-6 , 13-11 , 13-12 Direct-to Cancelling 4-6 Direct-to K ey 1-3 Direct-to navigation 1-11 , 4-6 Display backlighting 13-2 , 13-3 Display contrast 9-28 , 9-29 Distance measurements (on map) 3-13 DIS (distance) 1-11 , 1-12 , 3[...]

GNC 420(A) Pilot’ s Guide and Reference I-3 INDEX Lock ed waypoints 13-2 M Magnetic variation 7-15 , 9-21 , 9-24 Main page groups 8-1 , 9-1 Manual sequence 6-21 , 6-25 MAP (missed approach point) 4-1 , 6-3 Map datums 9-20 Map direct-to 3-8 Map orientation 3-10 , 3-11 Map P age 1-11 , 3-5 , 3-6 , 3-7 , 3-10 , 3-14 , 4-5 , 6-7 , 6-8 , 6- 13 , 6-17 [...]

GNC 420(A) Pilot’ s Guide and Reference I-4 INDEX R Radar coverage 7-4 RAIM prediction 9-17 RAIM protection limits 9-18 Reference waypoint 3-20 , 3-21 , 3-22 , 3-26 , 5-9 , 5-13 , 7-16 , 7-17 , 7-18 , 7-20 , 7-22 Remove the data card A-2 Removing approaches 5-14 Renaming a user waypoint 7-22 Requesting Graphical MET ARS 11-27 Request MET AR 11-25[...]

GNC 420(A) Pilot’ s Guide and Reference I-5 INDEX V V ectors-T o-Final 3-3 V ectors-to-final 6-17 V ertical navigation 3-25 , 13-1 , 13-2 , 13-10 VNA V (Vertical Navigation) P age 3-25 V olume 1-3 , 1-5 , 2-1 VORs 1-11 , 1-15 , 3-10 , 3-16 , 4-2 , 7-1 , 7-15 , 8-1 , 8-2 , 8-7 VOR P age 7-15 VSR (vertical speed required) 3-3 , 3-27 , 13-10 W W ar[...]

Blank P age[...]

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