Low Altitude Annunciation; Minimum Descent Altitude/Decision Height Alerting - Garmin G900X Pilot's Manual

LOW ALTITUDE ANNUNCIATION

The Low Altitude Annunciation is available only for aircraft with GIA 63W Integrated Avionics Units
NOTE:
when SBAS is available. This annunciation is not shown for systems with TAWS-B or TERRAIN-SVS, unless
TAWS-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 prescribed
altitude 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.

MINIMUM DESCENT ALTITUDE/DECISION HEIGHT ALERTING

For altitude awareness, a barometric Minimum Descent Altitude (MDA) or Decision Height (DH) can be set
in the Timer/References Window and is reset when the power is cycled. When active, the altitude setting is
displayed 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 appears
with 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, "Minimums
Minimums", is generated.
Alerting is inhibited while the aircraft is on the ground and until the aircraft reaches 150 feet above the setting
for the alert. If the aircraft proceeds to climb after having reached the MDA/DH, once it reaches 50 feet above
the MDA/DH, alerting is disabled.
MDA/DH
MDA/DH
Setting
190-00726-00 Rev. J
Figure 2-42 Low Altitude on RNAV GPS Approach with Vertical Guidance
Within 2500 feet
Bug
Figure 2-43 Minimum Descent Altitude/Decision Height Alerting Visual Annunciations
Garmin G900X Pilot's Guide
Altimeter
Within 100 feet Altitude Reached
FLIGHT INSTRUMENTS
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