Pilot Actions - Garmin GNC 420AW Pilot's Manual

Pilot Actions

If a 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.
NOTE: 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.
HTAWS
Pop-Up Alert
Annunciation
None
NOTE: HTAWS Caution Alerts are displayed as constant black text on a yellow background; HTAWS Warning Alerts are displayed as constant white text
on a red background.
HTAWS Alerts Summary
None "HTAWS System Failure"
None
None "HTAWS Not Available"
"Caution - Terrain, Terrain"
"Warning - Terrain, Terrain"
"Caution - Obstacle, Obstacle"
"Warning - Obstacle, Obstacle"
None
190-00356-30 Rev H
Aural Message
None
"Five Hundred"
"Four Hundred"
"Three Hundred"
"Two Hundred"
"One Hundred"
Part Four: Section 3
HTAWS Alerts
Description
HTAWS has failed
HTAWS has been inhibited by the crew,
or the aircraft groundspeed has fallen
below 30 knots (automatic inhibiting).
HTAWS not available.
Forward Looking Terrain Avoidance
Caution for Terrain
Forward Looking Terrain Avoidance
Warning for Terrain
Forward Looking Terrain Avoidance
Caution for Obstacle
Forward Looking Terrain Avoidance
Warning for Obstacle
HTAWS provides optional 500 ft through
100 ft (in 100 ft increments) altitude call
out alerts.
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