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 15.20.21
TCAS Normal Operation
TCAS is controlled from the Alerting and Transponder Control panel (ATP).
TA/RA is normally selected. However, it is sometimes necessary to select TA
ONLY to prevent nuisance RAs.
TA ONLY is selected during engine out operations to prevent RAs when adequate
thrust is not available to follow the RA commands.
TCAS Non–Normal Operation
The EICAS advisory message TCAS OFF is displayed if TCAS is not operating.
The message is inhibited below 400 feet radio altitude. No TCAS RA guidance is
displayed on the PFDs, no TCAS traffic symbols are displayed on the NDs or
mini-maps, and no TCAS voice alerts sound. An amber TCAS OFF message is
displayed on the NDs and mini-maps.
The EICAS advisory message TCAS RA (CAPTAIN or F/O) is displayed if TCAS
cannot display RA guidance on the respective PFD. The ND and mini-map traffic
displays and voice alerts are unaffected.
Voice Annunciation Condition Response
MAINTAIN
VERTICAL SPEED
CROSSING,
MAINTAIN
New RA, initial voice
annunciation.
Present pitch attitude and
vertical speed are outside the
red RA regions.
Airplane will pass through the
altitude of the traffic.
Continue to keep pitch
attitude and vertical speed
outside the red RA
regions.
MAINTAIN
VERTICAL SPEED,
MAINTAIN
New RA, initial voice
annunciation.
Present pitch attitude and
vertical speed are outside the
red RA regions.
MONITOR VERTICAL
SPEED
New RA, initial voice
annunciation.
Present pitch attitude and
vertical speed are outside the
red RA regions.
TRAFFIC, TRAFFIC New TA, initial voice
annunciation.
Attempt to visually locate
the traffic.
August 14, 2009
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