MD-11 Flight Crew Operations Manual
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Flight Controls -
Description and Operation
Flt.10.6
The SPOILER handle must be armed for automatic deployment of ground spoilers
for either landing mode or rejected takeoff mode. Moving the SPOILER handle
from the RET position enables the Autobrake System (ABS). The USE
MANUAL SPOILERS alert warns the flight crew of auto spoiler malfunctions.
A spoiler bias system extends the spoilers as necessary so that the spoiler panels
will not touch the flap/vane surfaces. When the aircraft is on the ground the
spoilers may be up a small amount (gap) depending upon slat/flap position, aileron
trim knob position, and spoiler cable system temperature.
Flap System
The trailing edge flap system consists of inboard and outboard flap segments on
each wing. Each segment is powered by two of the three hydraulic systems. The
inboard flap control valve is connected to the cockpit flap handle. The inboard
flaps are interconnected by a cable bus system to ensure symmetrical motion. The
flap system is mechanically controlled by the FLAP/SLAT handle on the forward
pedestal. Each flap is driven by two independently powered hydraulic actuators.
The outboard actuator on each flap is driven by hydraulic system 1 and the inboard
actuator by hydraulic system 2.
An automatic Flap Limiting system (FL) is installed. There is no automatic flap
limiting up to an airspeed of 175 knots. Beyond that airspeed, when the flaps are
extended between 22 and 50 degrees, the system provides automatic retraction to
the minimum position of 22 degrees flaps. A manual override is available in the
event of a malfunction.
The SEL FLAP LIM OVRD level 2 alert will be displayed to indicate that both
flap limiting channels have failed and manual override is required. The FLAP
LIMIT OVRD level 1 alert will be displayed to indicate manual selection of the
FLAP LIMIT selector to OVRD 1 or 2. In the case when both flap limiting
channels have failed, the SEL FLAP LIM OVRD level 2 alert will be replaced by
the FLAP LIMIT OVRD level 1 alert upon manual selection of the FLAP LIMIT
selector to OVRD 1 or 2.
The flap indicating system includes the following:
• Position transmitters in the left and right outboard flap follow-up systems
that send signals to the FCCs. These signals cause flap position to be
displayed on the SD. The left outboard transmitter provides a takeoff
warning when the flaps are extended 29 degrees or more (not takeoff).
Also installed is a switch that provides the landing gear warning when the
flaps are extended 31.5 degrees or more.
October 02, 2006
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