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mode and TA traffic is detected.
NOTE
TA ONLY mode is automatically selected when below
1,000 (±100) feet AGL.
Resolution Advisory (RA)
The TCAS computer issues resolution advisories, as appropriate, when TA/RA mode is active.
TA/RA mode is selected on the TCAS RTU main menu page. When the system determines a
potential threat requires immediate pilot action, a resolution advisory shows on the MFD. The
TCAS system gives an RA on the PFD in the form of a vertical speed command designed to
increase the separation between the intruding threat aircraft and own aircraft.
Resolution advisories show as red-only, or red-and-green bands. To comply with a resolution
advisory, avoid flying vertical speeds within the red banded areas, and fly the vertical speeds
within the green banded areas (if presented). “TRAFFIC” shows in red below the vertical speed
scale on the PFD when the system detects RA traffic. There are two types of RA: corrective and
preventive.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−64
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (CONT'D)
Corrective RA:
A corrective RA is issued if the TCAS computer has determined that corrective action needs to
be taken to avoid the threat traffic. The computer displays the vertical speed range to seek
and/or avoid on the PFD vertical speed display. Corrective RA audio annunciations are issued
by the TCAS computer over the cockpit audio system. (See TCAS Aural Annunciation Table).
Preventive RA:
A preventive RA is issued if the TCAS computer has determined that the current vertical speed
will resolve the threat situation. The computer displays the vertical speed range to maintain,
and the vertical speed range to avoid, on the PFD vertical speed display. Preventive RA audio
annunciations are issued by the TCAS computer over the cockpit audio system. (See TCAS
Aural Annunciation Table).
RA Communication and Coordination
In a case where both aircraft are TCAS equipped, the TCAS communicates with the other
aircraft to coordinate evasive strategies. This coordination may occur before an advisory is
issued, and is calculated for optimum safe separation using the least disruptive maneuver
possible. For example, if one aircraft is in a particular vertical speed (VS) profile, it may be
advantageous for that aircraft to increase or decrease its VS, as opposed to the other assuming
an evasive VS. Whatever maneuver is selected, this information is communicated to other
aircraft and ground facilities.
If the other aircraft is not TCAS equipped, the corrective or preventive maneuver responsibility is
assumed by the TCAS-equipped aircraft, and only the ground facility communication is possible.
Examples of TCAS Vertical Speed Advisories
Figure 17−10−57
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−65
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) (CONT'D)
TCAS Aural Annunciation Table
TCAS ADVISORY
VERSION 7 AURAL
ANNUNCIATION
VERSION 6.04 AURAL
ANNUNCIATION
Traffic Advisory Traffic, Traffic Traffic, Traffic
Climb RA Climb, Climb Climb, Climb, Climb
Descend RA Descend, Descend Descend, Descend, Descend
Altitude Crossing Climb RA Climb, Crossing Climb;
Climb, Crossing Climb
Climb, Crossing Climb;
Climb, Crossing Climb
Altitude Crossing Descend RA Descend, Crossing Descend;
Descend, Crossing Descend
Descend, Crossing Descend;
Descend, Crossing Descend
Reduce Climb RA Adjust Vertical Speed, Adjust Reduce Climb,
Reduce Climb
Reduce Descent RA Adjust Vertical Speed, Adjust Reduce Descent,
Reduce Descent
RA Reversal to a Climb RA Climb, Climb NOW;
Climb, Climb NOW
Climb, Climb NOW;
Climb, Climb NOW
RA Reversal to a Descend RA Descend, Descend NOW;
Descend, Descend NOW
Descend, Descend NOW;
Descend, Descend NOW
Increase Climb RA Increase Climb, Increase Climb Increase Climb, Increase Climb
Increase Descent RA Increase Descent,
Increase Descent
Increase Descent,
Increase Descent
Maintain Rate RA Maintain Vertical Speed,
Maintain
Monitor Vertical Speed
Altitude Crossing, Maintain
Rate RA (Climb and Descend)
Maintain Vertical Speed,
Crossing Maintain
Monitor Vertical Speed
Weakening of Initial RA Adjust Vertical Speed, Adjust Monitor Vertical Speed
Initial Preventive RA
(No change in vertical speed
required)
Monitor Vertical Speed Monitor Vertical Speed,
　
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