CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
2
Code
01
REVISION 38
AOM-145/1114
− FMS - The FMS provides latitude, longitude, ground speed, true
tracking, true heading and NAV mode. The same is applicable when
the airplane is equipped with dual FMS.
− GPS - The GPS provides latitude, longitude and altitude.
− Landing gear - The landing gear provides a discrete signal that
indicates gear down/locked condition.
− Flap - The Flap Control Unit provides one discrete signal that
indicates whether or not flaps are in landing position.
− AWU - The AWU receives the aural messages to be enunciated. It
also provides a discrete signal to indicate that the glideslope
advisory alert may be canceled without any restriction.
− Terrain Inhibit Switch - It is used in approach mode, in airports not
covered by an EGPWS database, assuring protection against
unwanted terrain alerts.
Some modes may have their associated envelopes shifted, so as to
suit particular airport requirements or to avoid nuisance warnings
under some flight situations. This feature is achieved either with
calculations or data provided by the FMS, if installed.
The GPWS/EGPWS provides alerts associated with the following flight
conditions:
− Mode 1 - Excessive descent rate.
− Mode 2 - Excessive closure rate to terrain.
− Mode 3 - Altitude loss after takeoff.
− Mode 4 - Insufficient terrain clearance.
− Mode 5 - Excessive deviation below glideslope beam.
− Mode 6 - Callouts.
− Mode 7 - Windshear (refer to Section 2-04-35).
− Terrain Awareness Alerting and Warning (EGPWS mode only).
− Terrain Clearance Floor (EGPWS mode only).
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