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GNC 420/420A
Quick Reference
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KEYS AND KNOBS 3 5 1 2 4 6 7 GNC 420 13 15 8 9 10 11 12 14 16 Figure 1-1 Keys and Knobs 7 12 1 COM Power/ Volume ENT (enter) MSG (message) 8 13 2 COM Flip-flop Small left knob FPL (flight plan) 9 14 3 CLR (clear) Large left knob PROC (procedures) 10 15 4 Direct-to Large right knob NRST 11 16 5 RNG (map range) Small right knob OBS 6 MENU Left-hANd Keys ANd KNobs The COM Power/Volume Knob controls unit power The small left knob is used to tune the kilohertz (kHz) and communications radio volume
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KEYS AND KNOBS RiG-hht ANd Keys ANd KNobs o b om Row Key tt s The NRST Key displays the Nearest Airports Page. Then, The RNG Key allows the pilot to select the desired turning the small right knob steps through the NRST pages. map range. Press the up arrow to zoom out to a larger The OBS Key is used to select manual or automatic area, or the down arrow to zoom in to a smaller area. sequencing of waypoints. Pressing the OBS Key selects The Direct-to Key provides access to the direct-to OB
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POWER ON 3) Once the self-test concludes, the Database sCReeN LAo y Ut (wiNdows) Versions Page appears which shows the current The GNC 420’s display is divided into three separate database information on the NavData® Card windows (or screen areas). The left side of the display and Terrain Data cards. Press the ENT Key to provides a COM Window (top two lines) and a user- acknowledge the Database Page and proceed defined data field below. The right side of the display to the Instrument
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FREQUENCY SELECTION Selecting a frequency: Quickly tuning and activating the 121.500 emergency channel: 1) Turn the large left knob to select the desired megahertz (MHz) value. For example, the ‘135’ Press and hold the COM Flip-flop Key for portion of the frequency ‘135.325’. approximately two seconds. d At A eNtR y Data is entered in the GPS Window using the large and small right knobs. The large right knob is used to move the cursor about the page. The small right knob is used to sel
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MAIN PAGE GROUPS mAiN P AGe GRoUPs NAV PAGe GRoUP The GNC 420’s main pages are divided into four The NAV Page Group includes seven pages. separate page groups: NAV, WPT, AUX, and NRST. Each page group is comprised of multiple pages. The page groups are selected using the large right knob. The individual pages are selected using the small right knob. Map TERRAIN Default NAV (if configured) Page Groups NAV Group WPT Group AUX Group NRST Group 7 NAV Pages 10 WPT Pages 4 AUX Pages 8 NRST Page
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DIRECT-TO NAVIGATION Selecting a direct-to destination: AUX PAGe GRoUP 1) Press the Direct-to Key. The Select Direct-to The AUX Page Group includes four pages. Waypoint Page appears, with the waypoint identifier field highlighted. Flight Planning Utility Setup 1 Setup 2 NOTE: The flight plan pages are selected by pressing the FPL Key and using the small right 2) Use the small and large right knobs to knob to select the desired page. enter the identifier of the desired destination waypoin
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DIRECT-TO NAVIGATION Selecting a direct-to destination from the Selecting a direct-to destination by facility Map Page: name or city: 1) Select the Map Page from the NAV Page 1) Press the Direct-to Key. The Select Direct-to Group. Waypoint Page appears, with the waypoint identifier field highlighted. 2) Press the small right knob to display a panning pointer. 2) Turn the large right knob to highlight the facility name (second line) or the city (third 3) Turn the small and large right knob
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VIEWING AIRPORT INFORMATION Selecting a nearby airport or a flight plan Viewing airport information: waypoint as a direct-to destination: 1) Turn the large right knob to select the WPT 1) Press the Direct-to Key. Page Group. ‘WPT’ appears in the lower right corner of the screen. 2) Turn the large right knob to highlight the nearest airport (NRST) or flight plan (FPL) 2) Turn the small right knob to select the desired field. WPT page. Airport information is displayed on the first six WPT
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VIEWING AIRPORT INFORMATION Viewing airport information by facility AUo- t tUNe feA tURe name or city: The GNC 420’s auto-tune feature allows the pilot to 1) Select the Airport Location Page (see page 6). quickly select any database COM frequency in the GPS 2) Press the small right knob to activate the Window as the standby frequency. With a minimum cursor. of keystrokes, any COM frequency listed in the GPS Window can be transferred to the standby field of the 3) Turn the large right kn
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DEFAULT NAV PAGE Quickly displaying the Default NAV Page: def AULt NAV P AGe From any page, press and hold the CLR Key for TO/FROM Flag Course Deviation approximately two seconds. Indicator (CDI) Selecting a different data item for any data field: 1) With the Default NAV Page displayed, press the MENU Key to display the Default NAV Page Menu. 2) The ‘Change Fields?’ option is already highlighted, so press the ENT Key to select this option. Active Leg of Flight Plan User-selectable Data
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MAP PAGE 4) Turn the small right knob to display the list The following symbols are used to depict the various of available data items. Continue turning the airports and NAVAIDs on the Map Page: small right knob to select the desired data Symbol Description item from the list. Airport with hard surface runway(s); (primary runway shown) Airport with soft surface runway(s) only Private Airfield Heliport VOR 5) Press the ENT Key to select the desired data VOR/DME item and return to the Default
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FULL SCREEN MAP Selecting a different data item for any data field: 1) With Map Page displayed, press the MENU Key to display an options menu. 2) Turn the large right knob to highlight ‘Change Fields?’ and press the ENT Key. 3) Turn the large right knob to highlight the data field to be changed. 3) To re-display the data fields, follow steps 1 and 2, but instead select ‘Data Fields On?’ from the 4) Turn the small right knob to select the desired options menu. type of data for this field
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NAVCOM PAGE Inhibiting TERRAIN: Scrolling through the list of frequencies: NAVCom P AGe 1) Select the TERRAIN Page and press the MENU 1) Activate the cursor, if not already active, by The NAVCOM Page provides a list of the airport Key. ‘Inhibit Terrain?’ is selected by default. pressing the small right knob. communication and navigation frequencies at the 2) Turn the large right knob to move the cursor departure, enroute, and arrival airports. through the list of frequencies. If there are
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NEAREST AIRPORTS Scrolling through the list of frequencies: Viewing a list of nearest airports: 1) Activate the cursor, if not already active, by Press the NRST Key to display the Nearest pressing the small right knob. Airport Page. ‘NRST’ will appear in the lower right corner of the screen. 2) Turn the large right knob to move the cursor through the list of frequencies. If there are more frequencies in the list than can be displayed on the screen, a scroll bar along the right-hand side
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NEARBY AIRPORTS Viewing additional information for a Selecting a nearby airport as a direct-to nearby airport: destination: 1) Highlight the identifier of the desired airport by 1) Press the Direct-to Key. The Select Direct-to scrolling through the list, as described in the Waypoint Page appears, with the waypoint preceding procedure. identifier field highlighted. 2) Press the ENT Key to display the Airport 2) Turn the large right knob to highlight the Location Page for the selected airport
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FLIGHT PLANS Creating a new flight plan: Navigating a flight plan: 1) Press the FPL Key and turn the small right 1) Press the FPL Key and turn the small right knob to display the Flight Plan Catalog Page. knob to display the Flight Plan Catalog Page. 2) Press the MENU Key to display the Flight Plan 2) Press the small right knob to activate the Catalog Page Menu. cursor. 3) Turn the large right knob to highlight ‘Create 3) Turn the large right knob to highlight the New Flight Plan?’ and press
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SELECT AN APPROACH Editing a flight plan: 1) Press the FPL Key and turn the small right knob to display the Flight Plan Catalog Page. 2) Press the small right knob to activate the cursor. 3) Turn the large right knob to highlight the desired flight plan and press the ENT Key. 3) A window appears listing the available 4) To add a waypoint to the flight plan, turn the procedures. Turn the large right knob to large right knob to select the point to add highlight the desired procedure and pr
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ACTIVATE AN APPROACH 5) Turn the large right knob to highlight ‘Load?’ A selected approach may be activated or loaded. Once or ‘Activate?’ and press the ENT Key. (‘Load?’ an approach is selected, it may be activated for navigation adds the procedure to the flight plan without from the Procedures Page. Activating the approach overrides the ‘enroute’ portion of the active flight plan, immediately using it for navigation guidance. This allows the pilot to continue navigating the proceeding
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FLYING AN APPROACH Activating the approach with vectors to • As the aircraft progresses to each approach final: waypoint, a waypoint alert message (‘NEXT DTK # # #º’) will appear in the lower right corner of 1) With an approach loaded in the active flight the display (see page 15). plan, press the PROC Key to display the Procedures Page. • When the pilot should begin a course change (via a standard rate turn), turn advisories (‘TURN TO # 2) Turn the large right knob to highlight ‘Activate
