MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.3
Primary Flight Display (PFD)
The PFDs are located on the Captain's and First Officer's instrument panel. The
PFDs show aircraft speed, altitude, vertical speed, attitude, heading, and flight
modes. The PFD symbology maintains the Basic-T with attitude in the center,
airspeed on the left, altitude/vertical speed on the right, and direction of flight on
the bottom. In addition, the PFD shows glideslope and localizer deviations, flight
modes, bearing info when on emergency power, radio altitude, pitch and roll
limits, limit speeds, slip/skid, flight crew or FMS selected speeds, altitudes,
heading, failure flags, and warnings.
Normal (on-side) sources are not annunciated. Abnormal (off-side) sources are
annunciated near the associated symbology. Refer to the Aircraft General chapter
for a complete description of abnormal source annunciation.
Flight Mode Annunciator (FMA)
The FMA annunciations appear across the top of the PFD. The FMA shows what
the aircraft is being controlled to, and how the commanded state should be
achieved. Each FMA annunciates speed control modes, AP/FD lateral modes,
AP/FD vertical modes, and associated control targets.
AP Disconnect Switches
The AP disconnect switches are installed on the outboard horn of the Captain's and
First Officer's control wheels. Operation of either switch disconnects the AP.
AP Disengage Warning System
The AP disengage warning system consists of a flashing red AP OFF on the FMA
and aural warning tone. After this warning, pushing either AP disconnect switch
changes the AP OFF to a steady white FMA (amber if the disconnect was the
result of a failure and no AP is available). The AP OFF warning light is reset if the
AP is re-engaged. The aural tone is reset when either of the disconnect switches
are pushed after at least one cycle of the tone is complete or when the AP is
re-engaged.
ATS Disconnect Switches
The ATS disconnect switches are on throttle levers 1 and 3. Operation of either
switch disconnects the ATS.
ATS Disengage Warning System
The ATS disengage warning system consists of a flashing red ATS OFF on the
FMA. All disconnects, except those due to landing rollout thrust reversal, actuate
the warning. Pushing either ATS disconnect switch changes the flashing red ATS
OFF to a steady white (or amber if ATS not available). The warning is reset if the
ATS is reengaged.
October 02, 2006
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