The Obstacle Database contains only KNOWN obstacles and does not contain
ALL existing obstacles. The Obstacle Database does not contain the location of
power line poles or wires.
HTAWS aurals may be selected to be in Male or Female voice. Selecting the
voice gender is accomplished using Audio button under the Systems page.
HTAWS also includes pilot selectable Voice Callouts (VCOs) of helicopter
height above terrain from 500 feet AGL to the surface.
If HTAWS is not installed, then the GTN will provide Terrain Proximity
functions which only provide visual depictions of terrain and obstacles on the
map page but provides no alerting or VCOs.
TERRAIN AND OBSTACLE DEPICTION
Terrain and obstacle elevations relative to aircraft altitude are depicted on the
Terrain page and may also be selected by the pilot for display on the Map page.
HTAWS NORMAL MODE
The GTN will power on with HTAWS in Normal Mode. Normal Mode
provides for separation from terrain and obstacles appropriate for enroute, night,
and operations where the pilot is not in visual contact with terrain.
HTAWS REDUCED PROTECTION MODE
The "RP MODE" menu selection on the terrain page is used to activate the
Reduced Protection (RP) functionality. RP Mode reduces alerting thresholds
and suppresses aural and visual cautions to allow operation in closer proximity
to terrain and obstacles while continuing to provide protection from terrain and
obstacles. An optional "RP MODE" external switch installation on the
instrument panel is allowed to toggle Reduced Protection mode in the same
manner as using the Terrain Menu selection.
HTAWS INHIBIT
The "INHIBIT" menu on the terrain page is used to inhibit visual and aural
HTAWS terrain and obstacle alerts. VCOs will still be provided. HTAWS shall
only be inhibited if the pilot is certain of the ability to maintain separation from
terrain and obstacles.
HTAWS TEST
The "HTAWS TEST" menu selection on the Terrain Page is used to activate a
manual test which verifies proper operation of the aural and visual annunciations
of the system. The aural message "HTAWS System Test, OK" is played if the
system passes the test, if the system fails the test "HTAWS System Failure" is
played. HTAWS test is only available while on the ground.
VOICE CALL OUTS
Voice callouts (VCOs) provide voice annunciation of the aircraft height above
terrain when that altitude is descended through. VCOs may be enabled by the
pilot in 100ft increments from 500 feet above ground level to the surface. If a
RFMS, Bell 407 GTN GPS/SBAS System
190-01007-J4 Rev. 1
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