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