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GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. P
Terrain
10.7.4.2 HTAWS Inhibit
HTAWS provides an “inhibit mode.” This mode deactivates aural and
visual alerts when they are deemed unnecessary by the aircrew. Pilots should
use discretion when inhibiting the HTAWS system and always remember to
enable the system when appropriate. VCO’s are not inhibited in Inhibit Mode.
Refer to section 10.7.6 for more information on HTAWS alerts. When alerting
is inhibited, all FLTA aural and visual alerting is suppressed. HTAWS should
only be inhibited when in visual contact with terrain and when the pilot can be
assured of maintaining clearance from terrain and obstacles. When conducting
en route operations and operations from published airports and heliports,
HTAWS should be operated in Normal mode. HTAWS configured units will
always start up with HTAWS alerts uninhibited.
To inhibit HTAWS alerts:
1. While viewing the Terrain/HTAWS page, touch
MENU
.
2. Touch
HTAWS Inhibit
. The green bar will show when HTAWS
Inhibit is active.
3. Touch
Back
to return to the Terrain/HTAWS display. The HTAWS
alerts are inhibited. The
annunciation is displayed
in the terrain annunciator field whenever HTAWS is inhibited.
NOTE
: When the ground speed is less than 30 knots HTAWS
will automatically display the "HTAWS INHB" annunciation. This
indicates that HTAWS is no longer providing protection.
This automatic “HTAWS INHB” cannot be removed by menu option
selection. Menu selections for INHIBIT HTAWS and RP Mode remain
available when HTAWS is automatically inhibited due to ground speed.
If the pilot selects a mode on the menu while HTAWS is auto inhibited
because it is less than 30 knots then the unit will enter that mode once
ground speed exceeds 30 knots. Hence, the presence of these selections
on the Menu.
Summary of Contents for GTN 625
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