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TCAS Voice Annunciations
TCAS FAIL Amber TCAS failed, or
TCAS information cannot be displayed on ND.
TCAS OFF Amber TFC switch pushed to display traffic but TCAS not
selected on transponder panel.
TCAS TEST Cyan TCAS in test mode. Message is displayed on all ND
modes and ranges.
Voice Annunciation Condition Response
TRAFFIC, TRAFFIC New TA, initial voice
annunciaion.
Attempt to visually locate
the traffic.
MONITOR VERTICAL
SPEED,
MONITOR VERTICAL
SPEED
New RA, initial voice
annunciation.
Present pitch attitude is outside
the red RA regions.
Continue to keep pitch
attitude outside the red RA
regions.
CLIMB, CLIMB,
CLIMB
New RA, initial voice
annunciation.
Present pitch attitude is within
the red RA regions.
Increase pitch attitude to
remain outside the red RA
regions.
CLIMB, CROSSING
CLIMB,
CLIMB, CROSSING
CLIMB
New RA, initial voice
annunciation.
Present pitch attitude is within
the red RA regions.
Airplane will climb through the
altitude of the traffic.
Increase pitch attitude to
remain outside the red RA
regions.
DESCEND,
DESCEND, DESCEND
New RA, initial voice
annunciation.
Present pitch attitude is within
the red RA regions.
Decrease pitch attitude to
remain outside the red RA
regions.
DESCEND,
CROSSING DESCEND
DESCEND,
CROSSING DESCEND
New RA, initial voice
annunciation.
Present pitch attitude is within
the red RA regions.
Airplane will descend through
the altitude of the traffic.
Decrease pitch attitude to
remain outside the red RA
regions.
ND Message Color Description
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
15.20.12 D6-30151-425
Warning Systems -
System Description
TCAS Normal Operation
The TCAS operating mode is controlled from the transponder panel. TCAS is
normally operated in the TA/RA mode. However, it is sometimes necessary to
operate in TA ONLY mode to prevent nuisance RAs.
TA ONLY mode is used during engine out operations to prevent RAs when
adequate thrust is not available to follow the RA commands. Also, TA ONLY
mode can be used when intentionally operating near other traffic that may cause
RAs, such as during parallel approaches and VFR operations.
INCREASE CLIMB,
INCREASE CLIMB
Existing RA, TCAS requires
change in vertical rate.
Present pitch attitude is within
the red RA regions.
Adjust pitch attitude to
remain outside the red RA
regions..
REDUCE CLIMB,
REDUCE CLIMB
INCREASE DESCENT,
INCREASE DESCENT
REDUCE DESCENT,
REDUCE DESCENT
DESCEND, DESCEND
NOW,
DESCEND, DESCEND
NOW
Existing RA, previous TCAS
vertical guidance was to climb.
Present pitch attitude is within
the red RA regions.
Decrease pitch attitude to
remain outside the red RA
regions.
CLIMB, CLIMB NOW,
CLIMB, CLIMB NOW
Existing RA, previous TCAS
vertical guidance was to
descend.
Present pitch attitude is within
the red RA regions.
Increase pitch attitude to
remain outside the red RA
regions.
CLEAR OF CONFLICT TCAS PFD vertical guidance is
no longer displayed and traffic
changes to a TA symbol.
Separation is increasing and the
RA will not occur.
However, the voice
annunciation will not sound if
TCAS can no longer predict
the track of the RA aircraft.
Attempt to visually locate
the traffic.
Voice Annunciation Condition Response
April 01, 2001
747 Operations Manual
Warning Systems -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 15.20.13
TCAS Non–Normal Operation
The EICAS alert message TCAS OFF is displayed if TCAS is not operating. No
TCAS RA guidance is displayed on the PFDs, no TCAS traffic symbols are
displayed on the NDs, and no TCAS voice alerts sound. An amber TCAS OFF
message is displayed on both NDs.
The EICAS alert message TCAS RA (CAPTAIN or F/O) is displayed if TCAS
cannot display RA guidance on the respective PFD. The ND traffic displays and
voice alerts are unaffected.
The EICAS alert message TCAS is displayed if TCAS cannot display TCAS RA
guidance on either PFD, and cannot display TCAS traffic symbols on either ND.
An amber TCAS FAIL message is displayed on both NDs, and TCAS voice alerts
will not occur.
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