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stricted 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 transpon-der, the selected transponder is enlarged
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
17-01-09 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 pro-jected 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 ver-tical 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 non-threat airplane(s), which have a flight path that approaches the collision area. The PT symbol is displayed if the tar-get 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.
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