User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
(c) Resolution Advisory (RA) Messages
Resolution advisories indicate evasive vertical maneuvers calculated to
increase separation between the TCAS aircraft and the intruder
(corrective advisory), or to indicate certain changes in vertical speed are
not recommended (preventive). Resolution advisory messages are
repeated twice.
RAs are annunciated on the T
3
CAS computer unit using the voice
messages listed below as determined by Collision Avoidance System
(CAS) data. The following messages will not immediately follow another
message from this paragraph if it causes a reversal of sense. For
example, a “CLIMB, CLIMB” message cannot immediately follow a
:”DESCEND, DESCEND” message.
1 “CLIMB, CLIMB”: Climb at the rate shown on the VSI or other
suitable indicator.
2 “DESCEND, DESCEND”: Descend at the rate shown on the VSI or
other suitable indicator.
3 “MONITOR VERTICAL SPEED”: Verify that vertical speed is out of
the illuminated red VSI arc, or comply with another suitable indicator.
Safe separation is based upon maintaining the current vertical
speed.
4 “LEVEL OFF, LEVEL OFF”: Reduce climb or descent rate, maintain
level flight.
5 “MAINTAIN VERTICAL SPEED, MAINTAIN”: Safe separation is
based upon maintaining the current vertical speed.
6 “MAINTAIN VERTICAL SPEED, CROSSING, MAINTAIN”: Maintain
vertical speed while crossing the intruder’s flight path.
7 “CLEAR OF CONFLICT”: Range is increasing, and separation is
adequate; return to assigned clearance.
8 “CLIMB, CROSSING CLIMB—CLIMB, CROSSING CLIMB”: Safe
separation is best be achieved by climbing through intruder’s flight
path.
9 “DESCEND, CROSSING DESCEND, DESCEND, CROSSING
DESCEND”: Safe separation is best achieved by descending
through the intruder’s flight path.
(d) Enhanced RA Messages
Enhanced RAs are annunciated on the T
3
CAS computer unit using the
voice messages listed below as designated by the CAS data when the
initial resolution advisory does not provide sufficient vertical separation.
These messages are annunciated to convey a sense of urgency. The
following messages can immediately follow a message from the previous
paragraph and can have a reversal of sense.
NOTE:
These advisories are expected to occur only on rare
occasions, usually when an intruder suddenly changes its
current flightpath (Maneuvering intruder).
Pub. No. 8600200-001, Revision 004
34-45-29
1-83
04 Nov 2014
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