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Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (CONT'D)
Traffic Alert (TA)
The traffic alert (TA) is issued when an intruding aircraft penetrates the 35 second TCAS
surveillance area, and is considered by the TCAS computer to be a possible threat. The TA
provides the flight crew with an opportunity to use the TCAS display on the navigation display
(PFD/MFD), in order to assist in visually locating the intruding aircraft.
The traffic alerts (TAs) consist of the following:
• Aural advisory “TRAFFIC, TRAFFIC” is sounded;
• Yellow word TRAFFIC is displayed below the ADI on the PFD; and
• Yellow TAs are shown on the navigation display of the PFD/MFD as a solid yellow circle.
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
ADVISORY VOICE MESSAGE PROPER PILOT RESPONSE
Clear “Clear of Conflict” Resume normal flight, apparent conflict of airspace has been
resolved.
Traffic “Traffic, Traffic” Gain visual contact with traffic. Check TCAS display for traffic
bearing and range, if necessary. Assess the threat, and
prepare to execute the evasive maneuver that TCAS issues.
Preventive RA “Monitor Vertical Speed” Be alert for approaching traffic. Make sure that the VSI needle
does not enter the red area of the TCAS VSI display.
Preventive RA “Maintain Vertical Speed
Maintain”
Maintain current vertical speed and direction. Make sure that
the VSI needle does not enter the red area of the TCAS VSI
display.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−68
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (CONT'D)
ADVISORY VOICE MESSAGE PROPER PILOT RESPONSE
Preventive RA “Maintain Vertical Speed
Crossing Maintain”
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
Adjust”
Indicates a weakening of the RA. Pilot should initiate a return
to the assigned altitude.
Corrective RA “Climb, Climb” Change vertical speed to 1,500 FPM climb, or as indicated on
the TCAS VSI display.
Corrective RA “Climb, Crossing Climb
Climb, Crossing Climb”
Same as CLIMB, except that it indicates that the flight paths
will cross at some altitude.
Corrective RA “Descend, Descend” Change vertical speed to 1,500 FPM descent, or as indicated
on the TCAS VSI display.
Corrective RA “Descend, Crossing
Descend, Descend,
Crossing Descend”
Same as DESCEND, except that it indicates that the flight
paths will cross at some altitude.
Corrective RA “Adjust Vertical Speed
Adjust”
Reduce vertical climb speed to that shown on the TCAS VSI
display.
Corrective RA “Increase Climb
Increase Climb”
Follows a CLIMB advisory. Increase the vertical climb speed
as shown on the TCAS VSI display (typically 2,500 FPM).
Corrective RA “Increase Descent
Increase Descent”
Follows a DESCEND advisory. Increase the vertical descent
speed as shown on the TCAS VSI display (typically 2,500
FPM).
Corrective RA “Climb, Climb Now
Climb, Climb Now”
Follows a DESCEND advisory to indicate a change in vertical
direction is needed. Initiate an immediate climb from the
　
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