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The TAs are displayed when TA ONLY or TA/RA mode is active. These modes are selected on the ATC/TCAS control page of the CDU, or on the TCAS – MFD radio tuning window.
Resolution Advisory (RA)
When the intruder penetrates the 25-second surveillance area and is considered a threat, the TCAS initiates a resolution advisory. There are two types of RAs: corrective and preventive.
Preventive RA
To avoid a conflict in the vertical plane, the preventive RA will advise the pilot not to fly in a certain direction.
Corrective RA
The corrective RA advises the pilot to alter the current flight path in the vertical plane.
The corrective RAs are given to the pilots as voice messages, and on the PFD vertical speed instrument as avoidance guidance instructions.
Aural alerts, in the form of voice messages, are listed in the TCAS Aural Alerts table. The TCAS resolution advisory aural alerts are based on the pilot promptly initiating the correct RA maneuver. If an additional corrective RA is issued, the tone of the voice message increases in urgency.
The maneuver should be initiated within 2.5 seconds.
TCAS Aural Alerts
NAVIGATION SYSTEMS Description Vol. 2 17.10.69
Oct 05/06
ADVISORY VOICE MESSAGE PROPER PILOT RESPONSE
Preventive RA A flight path crossing is predicted, but is being monitored by
TCAS. Maintain current vertical speed and direction. Make
sure that the VSI needle does not enter the red area of the
TCAS VSI display.
Preventive RA “Adjust Vertical Speed Indicates a weakening of the RA. Pilot should initiate a return Adjust” to the assigned altitude.
Corrective RA Change vertical speed to 1,500 FPM climb, or as indicated on the TCAS VSI display.
Corrective RA Same as CLIMB, except that it indicates that the flight paths
will cross at some altitude.
Corrective RA Change vertical speed to 1,500 FPM descent, or as indicated on the TCAS VSI display.
Corrective RA Same as DESCEND, except that it indicates that the flight
paths will cross at some altitude.
Corrective RA Reduce vertical climb speed to that shown on the TCAS VSI display.
Corrective RA “Increase Climb Follows a CLIMB advisory. Increase the vertical climb speed Increase Climb” as shown on the TCAS VSI display (typically 2,500 FPM).
Corrective RA Follows a DESCEND advisory. Increase the vertical descent speed as shown on the TCAS VSI display (typically 2,500 FPM).
Corrective RA Follows a DESCEND advisory to indicate a change in vertical direction is needed. Initiate an immediate climb from the current descent to provide adequate separation. Corrective RA
“Descend, Descend Now
Follows a CLIMB advisory to indicate a change in vertical Descend, Descend Now”
direction is needed. Initiate an immediate descent from the current climb to provide adequate separation.
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