Garmin GTN 625Xi, Pilot'S Manual

Page: 447 / 534

Hazard Awareness
190-02327-03 Rev. C Pilot’s Guide 5-139
HTAWS VCO SELECTION
If a radar altimeter is interfaced to GTN, alerts are available down to 50 feet and the
height above terrain when the radar altimeter is used to generate the callouts.
To select VCO choices:
1. Tap
System
>
Audio
>
Voice Callouts
.
2. Tap
MAX Voice Callout
to select the Voice Call Outs.
3. The values above the selected value will be disabled (Off).
HTAWS NOT AVAILABLE ALERT
•
Requires a 3D GPS navigation solution along with specific vertical accuracy
minimums.
•
“HTAWS N/A” displays if solution becomes degraded or aircraft is out of
database coverage area.
HTAWS FAILURE ALERT
If the terrain/obstacle database is not available, the aural message “HTAWS System
Failure” is issued along with the “HTAWS FAIL” annunciation.
HTAWS ALERT SUMMARY
HTAWS Caution Alerts appear as constant black text on a yellow background.
HTAWS Warning Alerts appear as constant white text on a red background.
PILOT ACTIONS
If an HTAWS warning and associated aural are received, the pilot should immediately
maneuver the rotorcraft in response to the alert unless the terrain or obstacle is
clearly identified visually and determined by the pilot not to be a factor to the safety
of the operation.
A HTAWS caution alert indicates terrain or obstacle nearby. If possible visually locate
the terrain or obstacle for avoidance. A HTAWS warning alert may follow a HTAWS
caution unless the aircraft’s path towards the terrain or obstacle is changed.
Display of terrain and obstacles on the display is supplemental data only.
Maneuvering solely by reference to the terrain and obstacle data is not
recommended or authorized.