MD-11 Flight Crew Operations Manual
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Instrumentation and Navigation -
Description and Operation
Inst.10.14
Operating Constraints
TCAS operating constraints are as follows:
• Descend RAs are inhibited below 1,200 feet AGL in takeoff and 1,000
feet AGL in approach.
• Increase descent RAs are inhibited below 1,450 feet AGL.
• Climb RAs are inhibited above 44,000 feet MSL.
• RAs are inhibited below 1,100 feet in takeoff and 900 feet in approach.
• There are no TCAS voice warnings below 500 feet (+/-100 feet).
• There are no TCAS voice warnings or RAs during windshear guidance.
• There are no TCAS voice warnings or RAs during GPWS warnings.
• RAs are based on pilots starting the maneuver within 5 seconds (for a
corrective RA).
Failure Flags And Warnings
Failure Annunciation
There are two major types of failure annunciation, invalid data and cross-side
miscompared data. Invalid data is removed from the screen. Miscompared data is
displayed with a miscompared flag.
When invalid data is removed from the screen, it may be replaced by a flag (some
non-essential data is removed from the screen only). These flags consist of an X
covering the area of removed data.
The Xs may be of two colors: Red Xs signify a loss of data requiring immediate
crew awareness and action to restore the loss of data. Amber Xs signify a loss of
data requiring immediate crew awareness but action to restore the data may be
momentarily deferred.
NOTE: On very rare occasions a parameter may “X” out and then
return. In this case, the data is most likely valid and the pilot should
comply with any related alerts.
Primary Flight Display
Comparison Monitor Annunciation
Captain and First Officer PFD data is cross compared by the DEUs. If the
difference between the parameters exceeds a predetermined value, a miscompare
annunciation is shown in amber below the speed control window (upper left PFD).
A NO COMPARE message indicates comparisons are not being done due to a
crosstalk bus failure.
The following miscompare annunciations can be displayed on the PFD:
• ATT - for IRS pitch roll.
• ALT - for CADC failure.
November 16, 2009
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