Garmin GNC 420(A) Pilot's Manual & Reference

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Garmin GNC 420(A) Pilot's Manual & Reference Manual pdf 229 page image

GNC 420(A) Pilot’s Guide and ReferenceSECTION 13 – MESSAGES,ABBREVIATIONS, & NAV TERMS13-1SECTION 13: MESSAGES, ABBREVIATIONS, AND NAV TERMS13.1 MESSAGESThe GNC 420 uses a flashing ‘MSG’ annunciator at the bottom of the screen (directly above the MSG Key) to alertthe pilot of any important information or warnings. While most messages are advisory in nature, warning messages mayrequire pilot intervention.When the ‘MSG’ annunciator flashes, press the MSG Key to display the message. Press the MSG Key again to returnto the previous page.The following is a list of available messages and their meanings:Message DescriptionAirspace ahead -- lessthan 10 minutesThe GPS-calculated course is projected to enter a special use airspace within 10 minutes.This message is automatically disabled within 30 nm of an arrival airport, when an approachis loaded.Airspace near andaheadThe GPS-calculated position is within 2 nm of the boundary of a special use airspace and thecourse is projected to enter the airspace within 10 minutes. This message is automaticallydisabled within 30 nm of an arrival airport, when an approach is loaded.All data referenced toTrue North The GNC 420 has not detected a NavData Card in the left data card slot.Altitude input failureThe GNC 420 is configured to receive altitude serializer data (Icarus, Rosetta, or Shadin) andit is not being received. Or, the data was being received, but has been interrupted. If a greycode altitude input is available, it is used instead. If the problem persists, contact a Garmindealer and check the installation and installation settings. When this message occurs, nopilot action is required if enough satellites are available for a 3D position fix (provided noRAIM warnings are present). However, if only a 2D position fix is possible, the pilot shouldmaintain the GPS altitude within 1,000 feet of pressure altitude by entering the altitude onthe Position Page.Approach is not activeThe approach could not transition to ‘active’, at 2 nm or closer to the FAF. Verify that ‘SUSP’does not appear directly above the OBS Key, indicating the auto waypoint sequencing issuspended. This message also appears if Receiver Autonomous Integrity Monitoring (RAIM)has determined that sufficient GPS satellite coverage does not exist for the current phase offlight (along with a ‘RAIM not available from FAF to MAP’ message).Approaching targetaltitudeThe current GPS-computed altitude is within 500 feet of the final Vertical Navigation targetaltitude.190-00140-20 Rev. K