MD-11 Flight Crew Operations Manual
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Flight Controls -
Description and Operation
Flt.10.12
In a slowdown maneuver, prior to stickshaker, alpha-based indications are as
follows:
• The PLI on the PFD meshes with the airplane symbol and turns amber.
• PFD airspeed digits turn amber and are boxed in amber.
• LSAS stall protection (nose down elevator) engages if windshear
command guidance is off. If windshear command guidance is on, LSAS
stall protection engages later (red PLI).
At stickshaker condition:
• PLI feathers mesh with the horizon bar and turns red.
• PFD bank angle limits turn red.
• PFD airspeed digits turn red and are boxed in red.
• Stickshaker actuates (all configurations, to Mach 0.90).
• Outboard slats (autoslats) extend and remain extended for 5 seconds after
the condition has been corrected. This applies if in clean configuration
with Mach at or below 0.55.
• LSAS stall protection engages if windshear command guidance is on. If
windshear command guidance is off, LSAS stall protection should have
engaged earlier (amber PLI).
Speed-based indications are accurate only during level maneuvering (bank angle
compensated only). They are generated by the FMC.
In a steady slowdown, speed-based indications apply. When the airplane slows to
Vmin:
• The airspeed pointer hits the top of the amber column on the PFD
airspeed tape.
• The airspeed digits turn amber and are boxed in amber.
As the airplane slows more and reaches Vss:
• The airspeed pointer hits the top of the red column on the PFD airspeed
tape.
• The airspeed digits turn red and are boxed in red.
If the airplane has not climbed through the ACCEL altitude (FMS TAKEOFF
page and G/A page) and flaps and slats are extended, the Vmin marker on the
airspeed display is a function of 1.2 Vs. If flaps are extended with slats retracted,
the Vmin marker is a function of 1.25 Vs. Vmin returns to 1.3 Vstall after the
airplane has climbed through ACCEL altitude.
Takeoff Deflected Ailerons System
A system for takeoff deflected ailerons deflects the inboard and the outboard
ailerons for takeoff and allows an additional takeoff flap setting of 28°.
With this system, for takeoff only, the neutral position of the ailerons is as follows:
October 02, 2006
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