787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 15.20.33
When TA/RA is selected on the transponder panel and a GPWS or PWS warning
alert occurs, TCAS automatically inhibits RA mode. During the inhibit, all
airplanes that would have been predicted as an RA are predicted as a TA. When
GPWS and PWS warning alerts are no longer occurring, the RA mode inhibit
ends.
Alert Messages Inhibited During Normal System Operation
Certain EICAS alert messages are time delayed, even though related flight deck
panel annunciator lights are illuminated. Time delay inhibits prevent normal
in–transit indications from being displayed as EICAS alert messages. For
example, valves are generally only sensed open or closed, not in–transit. When a
valve is in–transit, the message indicating the valve has failed to open or close is
inhibited to allow the valve time to move to the commanded position. If the valve
is not in the commanded position at the end of the inhibit time delay, the respective
EICAS alert message is displayed.
Alert Messages Inhibited By Other Alert Messages
Some EICAS alert messages are inhibited if another related alert message is
displayed. For example, individual hydraulic pump pressure messages are
inhibited if a hydraulic system pressure message is displayed.
Voice Annunciation Inhibits
Voice annunciations for warning alerts inhibit new voice annunciations for caution
alerts.
All voice annunciations are prioritized to aid flight crew decision making when
more than one alert could occur.
ND Display Alert Inhibits and Automatic Display
Alert displays on the NDs are prioritized to aid flight crew decision making when
more than one alert occurs. The displays are also prioritized when neither ND is
in MAP or MAP CTR mode.
Immediate windshear alert inhibits the automatic display of a new TCAS,
look-ahead terrain, or PWS alerts.
TCAS traffic can be displayed concurrently with either TERR and WXR display.
February 15, 2010
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