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of OT symbols on the MFD may be set to on or off. The control for this function is
located on the RTU TCAS main display page.
Other Traffic is available for display in variable altitude volumes. The controls for this
feature are also located on the RTU TCAS main display page. “NORMAL” mode is
the default mode. “NORMAL” mode sets the OT window from between 2700 feet
above to 2700 feet below own airplane altitude. Selecting “BELOW” extends the
lower portion of the OT window to 9900 feet below own airplane altitude. Selecting
“ABOVE” extends the upper portion of the OT window to 9900 feet above own
airplane altitude.
Proximate Traffic (PT)
Proximate traffic are non-threat aircraft within ± 1200 feet relative altitude and six NM
of own aircraft. Proximate traffic cannot be deselected, and is always shown on the
traffic display as an aid to the pilots when visually acquiring TAs and RAs.
Traffic Alert (TA)
The TCAS computer issues Traffic Alerts as appropriate when TA/RA mode is active.
TA/RA mode is selected on the TCAS RTU main menu page. Traffic alerts are issued
for non-threat intruder aircraft that should be monitored because, depending upon their
continued flight path, they may become RA traffic. Traffic alerts are issued aurally and
visually on the MFD, starting 20 to 48 seconds before the calculated closest point of
approach. The audio message “TRAFFIC, TRAFFIC” is annunciated over the aircraft
audio system, and the message “TRAFFIC” shows in yellow below the VSI on the
PFD when the system detects TA traffic.
When the TCAS computer is operating in TA ONLY mode, RA traffic shows as TA
traffic, and no commanded vertical speeds show on the PFD. TA ONLY mode is
selected via the RTU TCAS main display page. “TA ONLY” shows in white on the
PFD when the system is operating in TA ONLY mode. “TA ONLY” shows in yellow
when the system is operating in the TA ONLY mode and TA traffic is detected.
TA ONLY mode is automatically selected when below 1100 feet
AGL on takeoff and 900 feet AGL on landing.
NOTE
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-81
P I LOT T R A I N I N G GU I D E
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.
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
Table 17-12).
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. The command “Monitor Vertical Speed” is issued by the TCAS
computer over the cockpit audio system.
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.
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