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Applicable to: ALL
GENERAL
A Traffic Alert and Collision Avoidance System (TCAS) provides the flight crew with traffic information and warnings of potential conflicts with vertical avoidance instructions. The TCAS can only detect and indicate other traffic, that is equipped with a transponder.
The ND displays the traffic information, together with:
? The bearing and range to the intruder
? The intruder closure rate
? The relative altitude difference.
If the TCAS considers the intruder to be a potential collision threat, it generates a visual and aural Traffic Advisory (TA). If it considers the intruder to be real collision threat, it generates a visual and aural Resolution Advisory (RA).
INTRUDER CLASSIFICATION
Intruder
Display Type of
collision threat Aural warning Crew action
No threat
traffic or others   No threat - -
 -17 (w)   
Proximate   Consider as
No threat - -
 -10 (w)   
Traffic
Advisory (TA)   Potential threat "TRAFFIC TRAFFIC" Establish visual contact.
No evasive maneuver
 -09 (a)   
Resolution
Advisory (RA)   Collision threat Preventive, e.g.
"MONITOR V/S" Do not alter your flight path
and keep VS out of red sector
     
 -06 (r)  Corrective, e.g. "CLIMB" Smoothly and firmly (0.25 g)
follow VSI green sector within 5 s
   Corrective, e.g.
"CLIMB NOW" or
"INCREASE CLIMB" Smoothly and firmly (0.35 g) follow
VSI green sector within 2.5 s
 

  SUPPLEMENTARY INFORMATION
TCAS
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

OPERATIONAL RECOMMENDATIONS
Applicable to: ALL
The flight crew should select
? ABV in climb (+9 900 ft/-2 700 ft)
? ALL in cruise (+2 700 ft/ -2 700 ft)
? BELOW, if the cruise altitude is within 2 000 ftof FL 410, or in descent (+2 700 ft/ -9 900 ft)
? THRT in heavy traffic terminal area
? TA, in the case of:
‐ Engine failure
‐ Flight with landing gear down
‐ Known nearby traffic, that is in visual contact
‐ Operations at specific airports, and during specific procedures that an operator identifies as
having a significant potential for not wanted and not appropriate RAs, e.g. closely spaced parallel runways, converging runways.
Pilots should comply with the vertical speed limitations during the last 2 000 ft of a climb or descent. In particular, pilots should limit vertical speeds to 1 500 ft/min during the last 2 000 ft of a climb or descent, especially when they are aware of traffic that is converging in altitude and intending to level off 1 000 ft above or below the pilot's assigned altitude.
　
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本文鏈接地址：A318/A319/A320/A321 機組訓練手冊 FCTM Flight Crew Training Manual(179)