MD-11 Flight Crew Operations Manual
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Flight Controls -
Description and Operation
Flt.10.13
• 15° trailing edge down on the outboard ailerons.
• 11.5° trailing edge down on the inboard ailerons.
During all phases of flight except takeoff, the neutral (baseline) position of the
ailerons is as follows:
• 4° droop trailing edge down on the outboard ailerons.
• 0° (faired) on the inboard ailerons.
With the autopilot engaged, the control wheel moves slightly in roll and returns to
neutral when the flap/slat handle is moved to takeoff flap setting, and again when
the flap/slat handle is moved from the takeoff flap setting to 0/EXT.
Nose gear strut compression activation of the AILERON DEFLECTION OVRD
switch enables the takeoff command for aileron deflection. Once enabled, placing
the FLAP/SLAT handle in the takeoff flap range signals the actuator for
deflection. Placing the FLAP/SLAT handle in a setting other than the takeoff flap
range removes aileron deflection. Repositioning the handle back into the takeoff
flap range while the airplane is still on the ground restores the deflected aileron.
MD-11 DEF AIL is displayed on the FMS A/C STATUS page when the airplane
is configured for deflected ailerons takeoff.
The AIL DEFLECT DISAG alert is displayed if the ailerons are not in proper
position based on selected flap position, phase of flight, and actual aileron
position.
During takeoff, the aileron symbols on the SD synoptic CONFIGURATION page
droop to show the 15° trailing edge down (outboard ailerons) and 11.5° trailing
edge down (inboard ailerons). The baseline 4° droop (non-takeoff flight phases)
is not indicated on the SD.
Following takeoff (nose gear strut not compressed) aileron deflection remains
until normal wing cleanup when the FLAP/SLAT handle is positioned out of the
takeoff flap range. The ailerons return to baseline configuration (4° droop on
outboard ailerons and 0° inboard). The deflected aileron position is not enabled
again until nosewheel strut compression occurs and the FLAP/SLAT handle is
again placed in the takeoff flap range. Landings occur in the baseline aileron
configuration.
Following takeoff, and with the nose gear strut not compressed, the ailerons will
remain deflected until the FLAP/SLAT handle is positioned out of the takeoff flap
range. The ailerons should then return to the normal configuration (4° droop on
outboard ailerons and 0° inboard). On a normal takeoff, with the AILERON
DEFLECTION OVRD switch remaining in the normal position, regardless of the
FLAP/ SLAT handle position, the ailerons will not be able to deflect again until
after landing (nose-wheel strut compression), and the FLAP/SLAT handle is again
placed in the takeoff flap range.
October 02, 2006
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