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- When STBY, ALT ON or ALT OFF are selected, a 2 second delay is imposed before transmitting that mode selection
to the TCAS. When STBY is selected, a 2 second delay is imposed before transmitting to ATC. The standby
command delay prevents transient selection of standby during mode selection
- The transponder reports altitude in TA/RA, TA ONLY and ALT ON modes.
- The TRANSPONDER/TCAS mode selection on the MFD display is replaced with XPDR FAIL if the transponder
is failed and the mode is not in STBY
- When ALT OFF is selected, a 2 second delay is imposed before transmitting the mode selection to
prevent transient selection during mode selection
The altitude limits selection and annunciation is on the TRANSPONDER/TCAS radio primary display and TRANSPONDER/
TCAS radio sub menu. The selections are as follows:
- When using the DATA button the possible selections are ABV, NORM, BLW, and ABV/BLW. The order reverses
if the DATA knob is turned counterclockwise
- ABV selects the above altitude limit, BLW selects the below altitude limit. When both are selected, the unrestricted
altitude mode is invoked. When NORM is selected, ABV and BLW are deselected
- The altitude limits selection is inoperative if XPDR FAIL is annunciated
- Relative (REL) or absolute (ABS) on the TRANSPONDER/TCAS sub menu is enlarged when selected
- An open diamond symbol represents non-threat traffic that is displayed below the TRAFFIC legend. When OFF is
selected, non threat traffic is not displayed. When ON is selected all traffic is displayed
- Transponder selection is on TRANSPONDER/TCAS radio sub menu. When ATC1 or ATC2 is the active transponder,
the selected transponder is enlarged
NAVIGATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
17-01-10 CSP 100-6 REV 1
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (Cont)
- Pressing the TEST button will start a self-test program that will verify proper operation of the TA and RA displays
and of the aural advisories. The TEST mode does not affect normal TCAS operation. Should an actual TA or RA
occur during TEST sequence, the test is automatically terminated and the advisory is announced and displayed
THREAT LEVELS AND DATA TAGS
The system provides four types of advisories:
- Traffic Advisories (solid amber circle) - Traffic advisories (TA) symbols appear on the MFD, when target(s) is projected
to converge with the TCAS equipped airplane in approximately 35 seconds, with the closest point of the
approach being inside a minimum vertical separation envelope. Traffic advisories are generated for aircraft with
operative Mode S, Mode C, or Mode A transponders. The relative bearing and range of the intruder are displayed
- Resolution Advisory (solid red square) - Resolution advisories (RA) symbols appear on the MFD, when target(s) is
predicted to penetrate the protected vertical envelope in approximately 25 seconds. An RA display on the PFD vertical
speed indicator (VSI) indicates the vertical rate that must be achieved to maintain safe separation. During an
RA, red and green bands overlay the VSI scale. Red band indicates what vertical speed range should be avoided
and the green band indicates the vertical speed needed to achieve safe separation. The red band indicates pitch
rates that should be avoided and fly the vertical speeds within the green band. RA display can only be issued if an
intruder airplane is equipped with a Mode S transponder
- Proximity Traffic (solid cyan color diamond) - Proximity traffic (PROX) symbols appear on the MFD when nonthreat
airplane(s), which have a flight path that approaches the collision area. The PT symbol is displayed if the target
does not qualify for a TA but is currently within ± 6 nm and ± 1200 feet of the TCAS airplane
- Other Traffic (open cyan color diamond) - The other traffic (OT) is in the surveillance area, but is not a collision
threat
When altitude data is available, an ALT TAG shows the altitude of each intruder aircraft on the TCAS traffic display. When
the altitude of the intruder aircraft is more than that of the interrogation aircraft, ALT TAG shows above the traffic symbol.
When the altitude of the intruder aircraft is less than that of the interrogation aircraft, ALT TAG shows below the traffic
symbol. If the intruder aircraft altitude changes at a rate of ± 500 ft./min. or more, an arrow after the traffic symbol shows
the altitude change direction.
The TCAS system provides no indication of traffic conflicts if the intruder airplane is without an operative transponder.
The TUNE and TCAS CONTROL pages on the CDU are another way to control TCAS mode selection.
RESOLUTION ADVISORY
Resolution advisories (RA) advise the pilot that corrective action is required to avoid an intruder. RAs show on the vertical
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