MD-11 Flight Crew Operations Manual
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Warning and Alerting -
Description and Operation
Warn.10.15
SELCAL
The CAWS will provide an aural signal (single chime) when the SELCAL decoder
receives call information from the VHF and/or the HF COMM receivers. This
signal is provided by the SELCAL decoder (ground active).
Cockpit Timer Aural Tone
An aural tone will sound when the cockpit timer has counted down to zero.
Tire Failure Warning
The CAWS unit will sound an aural warning (voice only) when a tire failure is
detected. A voice warning TIRE FAILURE will sound three times.
Windshear Warning
The CAWS will sound an aural warning (tone and voice) if a windshear signal is
received from FCC 1 or 2.
Radio Altitude Voice Warnings
The CAWS will monitor the two radio altimeters and will sound airline selected
voice warnings when either altimeter sends the signal.
Ground Proximity Warning System (GPWS)
The GPWS provides visual and aural warnings associated with the following
flight conditions:
Mode 1 - Excessive Descent Rate
Mode 1 provides a warning for excessive descent profiles with respect to altitude
AGL during cruise and approach AGL. Two different warning boundaries are
possible:
• Mode 1 outer boundary - Penetration will activate the amber GROUND
PROX message on the PFD and produce the voice warning SINKRATE.
• Mode 1 inner boundary - Penetration will activate the red GROUND
PROX message on the PFD and produce the voice warning PULL UP.
Mode 2 - Excessive Terrain Closure Rate
Mode 2 provides a warning based on RA and how rapidly that RA is decreasing.
Mode 2 has two areas of application as follows:
October 02, 2006
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