Section 8 Terrain Awareness Warning System
8-26
IDU-680 EFIS Software Version 8.0E (Fixed Wing)
Rev A Nov, 2016
Table 8-11: Airplane TAWS Basic Parameters Determination
Parameter
Source
Notes
of AGL
Altitude
sources for terrain closure
rate.
Runway/
Reference point
location
EFIS
navigation
database
To be considered valid, the
following must apply:
1) Aircraft position is valid;
2) Aircraft position is within
the boundaries of the
navigation database; and
3) The navigation database
is not corrupt as
determined by a CRC-32
check at system
initialization.
8.14.
TAWS Automatic Inhibit Functions (Normal Operation)
The following automatic inhibit functions occur during normal TAWS
operation to prevent nuisance warnings:
1) FLTA function is automatically inhibited when in the Terminal,
Departure, IFR Approach, or VFR Approach modes and within
2NM and 1900’ of the reference point.
2) PDA function is automatically inhibited when within 2NM and
1900’ of the approach runway threshold.
3) GPWS Modes 1 through 4 are automatically inhibited when
below 50 feet AGL (radar altimeter AGL altitude) or below 100
feet AGL (terrain database AGL altitude).
4) GPWS Mode 5 is
inhibited below 200’ AGL. This form of
automatic inhibit remains active until the aircraft climbs above
1000’ AGL. This form of inhibiting prevents nuisance alarms on
missed approach when the glideslope receiver detects
glideslope sidelobes.
Summary of Contents for IDU-680
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Page 445: ...Traffic Rev A Nov 2016 IDU 680 EFIS Software Version 8 0E Fixed Wing T 1 Traffic...
Page 510: ...Datalink Rev A Nov 2016 IDU 680 EFIS Software Version 8 0E Fixed Wing D 1 Datalink...
Page 532: ...Weather Radar Rev A Nov 2016 IDU 680 EFIS Software Version 8 0E Fixed Wing WX 1 Weather Radar...
Page 547: ...Video Rev A Nov 2016 IDU 680 EFIS Software Version 8 0E Fixed Wing V 1 Video...
