190-00726-00 Rev. J Garmin G900X Pilot’s Guide 91FLIGHT INSTRUMENTSSYSTEMOVERVIEW FLIGHTINSTRUMENTS EIS AUDIO PANEL& CNS FLIGHTMANAGEMENT HAZARDAVOIDANCE AFCS ADDITIONALFEATURES APPENDICES INDEXLOW ALTITUDE ANNUNCIATIONNOTE: The Low Altitude Annunciation is available only for aircraft with GIA 63W Integrated Avionics Unitswhen SBAS is available. This annunciation is not shown for systems with TAWS-B or TERRAIN-SVS, unlessTAWS-B or TERRAIN-SVS is inhibited.When the Final Approach Fix (FAF) is the active waypoint in a RNAV GPS approach using vertical guidance,a Low Altitude Annunciation may appear if the current aircraft altitude is at least 164 feet below the prescribedaltitude at the FAF. A black-on-yellow ‘LOW ALT’ annunciation appears to the top right of the Altimeter,flashing for several seconds then remaining displayed until the condition is resolved.Figure 2-42 Low Altitude on RNAV GPS Approach with Vertical GuidanceAltimeterMINIMUM DESCENT ALTITUDE/DECISION HEIGHT ALERTINGFor altitude awareness, a barometric Minimum Descent Altitude (MDA) or Decision Height (DH) can be setin the Timer/References Window and is reset when the power is cycled. When active, the altitude setting isdisplayed to the lower left of the Altimeter and with a bug at the corresponding altitude along the Altimeter(once the altitude is within the range of the tape).The following visual annunciations occur when approaching the MDA/DH:• When the aircraft altitude descends to within 2500 feet of the MDA/DH setting, the ‘BARO MIN’ box appearswith the altitude in light blue text. The bug appears on the altitude tape in light blue once in range.• When the aircraft passes through 100 feet of the MDA/DH, the bug and text turn white.• Once the aircraft reaches the MDA/DH, the bug and text turn yellow and the aural alert, “MinimumsMinimums”, is generated.Alerting is inhibited while the aircraft is on the ground and until the aircraft reaches 150 feet above the settingfor the alert. If the aircraft proceeds to climb after having reached the MDA/DH, once it reaches 50 feet abovethe MDA/DH, alerting is disabled.Figure 2-43 Minimum Descent Altitude/Decision Height Alerting Visual AnnunciationsAltitude ReachedWithin 100 feetMDA/DHSettingMDA/DHBugWithin 2500 feet
