5-136 Pilot’s Guide 190-02327-03 Rev. C
Hazard Awareness
HTAWS/(H)Terrain Alerting
NOTE
HTAWS-enabled units can be identified by going to the Terrain page and checking the
lower right-corner for “HTAWS.”
FEATURE REQUIREMENTS
• Valid 3D GPS position
• Valid terrain/obstacle database
Garmin’s Helicopter Terrain Awareness Warning System (HTAWS) is an optional
feature to increase situational awareness and aid in reducing controlled flight into
terrain. Garmin HTAWS is TSO-C194 authorized. (H)Terrain Alerting is not TSO-C194
authorized.
HTAWS provides visual and aural annunciations when terrain and obstacles are a
h
azard to the aircraft.
POWER UP
During power-up of the unit, the terrain/obstacle database versions are displayed
along with a disclaimer to the pilot. At the same time, HTAWS self-test begins.
HTAWS gives the following aural messages upon test completion:
“HTAWS System Test, OK,” if the system passes the test.
“HTAWS System Failure,” if the system fails the test.
A test failure is also annunciated visually for HTAWS, as shown in the HTAWS Alert
Summary table.
Rotorcraft Ownship
HTAWS Relative
Terrain Depiction
HTAWS Terrain Display
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