Tcas Operation - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

TCAS OPERATION

The controls and displays are integrated with the Honeywell Primus
1000 system. Controls are through the RMUs and TCAS/annunciator
displays are on the MFD and PFDs and the Resolution Advisories (RA)
are integrated with the vertical speed indicator display on the PFDs.
The TCAS II interrogates other aircraft transponders and analyzes the
replies to determine range and bearing of the intruder. In addition, if
the intruder's transponder is reporting altitude, the relative altitude is
also determined. If the system predicts that safe boundaries may be vi-
olated, the system issues a Traffic Advisory (TA) which is displayed on
the MFD. Should the TCAS II processor determine that a possible colli-
sion exists, it issues visual and audio advisories to the crew to initiate
appropriate vertical avoidance maneuvers.
If an aircraft has a transponder, but does not have altitude reporting,
the TCAS will depict it on the TA display, but without the altitude in-
formation tag, and without the capability of providing evasive com-
mands. TCAS II is capable of generating a TA display of traffic from
Mode A transponder-equipped aircraft, and it is also capable of gener-
ating RA signals to avoid Mode C-equipped aircraft. For similar
Mode S-equipped aircraft, the airplane's TCAS II system coordinates
evasive maneuvers for both aircraft. TCAS I can process transponder
information from other aircraft equipped with Mode A, C, or S tran-
sponders, but does not receive altitude information to compute or co-
ordinate a Resolution Advisory (RA). If the depicted traffic is reporting
altitude and is climbing or descending at a rate of at least 500 feet per
minute, a trend arrow is displayed beside the traffic symbol indicating
that the aircraft is climbing or descending. If the intruder is not report-
ing altitude, the traffic symbol appears without an altitude tag or trend
arrow. The RA displays are incorporated into the vertical speed indica-
tor on the PFDs. Green FLY-TO zones and red NO-FLY zones are placed
on the vertical speed arc by the TCAS for collision avoidance. The zones
are not displayed on the arc until the TCAS detects an RA intruder and
computes the collision avoidance data. Synthesized voice commands
and announcements are issued by the TCAS over the airplane audio
system.
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PM-132A