KLM MD-11 - TCAS Display Modes; TCAS Operating Modes

MD-11 Flight Crew Operations Manual
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Instrumentation and Navigation -
Description and Operation
Inst.10.13
TCAS Display Modes
Pushing the TRFC switch on the ECP displays proximate or other TCAS targets
either full time or part time.
Full-Time Mode (TRFC selected). Pushing the TRFC switch displays proximate
and other traffic regardless of the occurrence of a TA or RA. In this case, TRFC
will appear in the lower left box on the ND.
Part-Time Mode (TRFC not selected). TAs and RAs cause TCAS targets to
automatically appear on all ND modes except PLAN mode. During a TA or RA,
any proximate or other traffic will also be displayed.
TCAS mode - This ND mode is selected by pushing the TCAS switch on ECP.
The ND will:
• Declutter (remove FMS course line, radar returns, bearing pointers, and
waypoint symbols).
• Go to a 10-mile range.
• Display a 5-mile range ring and a 2-mile range ring (made of asterisks).
TCAS mode range can be changed by using the INCR/DECR switches on the
ECP.
The 10-mile range is automatically selected only when selecting the TCAS
display from MAP, PLAN, VOR or APPROACH. If the NAV display is already
in TCAS mode at another range, pushing the TCAS switch again does not
automatically select the ND back to the 10-mile range.
TCAS Operating Modes
TA/RA mode - This mode is selected from the transponder control panel. In this
mode, TAs and RAs are generated on the basis of the calculated time for a threat
airplane to reach the CPA. The CPA will vary with altitude. An RA is generated
when an intruder is either 20, 25, or 30 seconds from the CPA, depending on
altitude. A TA is generated at 35, 40, or 45 seconds from the CPA.
TA mode - In this mode TCAS generates only TAs, proximate, and other traffic.
RAs are not generated. When in this mode, a white TA ONLY message appears
in the lower left of the ND and changes to flashing amber when a TA occurs. This
mode can be selected from the transponder control panel or occurs automatically
when:
• In flight below 1000 feet AGL (+/-100 feet).
• On ground and transponder control panel is set to TA or TA/RA.
• Whenever there is a GPWS warning or windshear guidance.
Autopilot Disconnect Switch - Pushing the AP disconnect switch during an RA
will always remove the FD bars from view. This occurs with the AP on or off. The
TCAS CLEAR OF CONFLICT voice message will automatically return the FD
bars into view.
November 16, 2009