MD-11 Flight Crew Operations Manual
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Landing Gear and Brakes -
Description and Operation
Land.10.4
If the electrical gear indicator fails, the main landing gear can be verified down
and locked by viewing a protruding button on the top surface of each wing. Main
gear up/doors closed can be verified by looking through a viewing window in the
cabin floor. Nose gear up or down and locked can be verified by checking the
alignment of marks painted on the nose gear assembly. This check is done through
two viewing tubes located in the floor of the forward main cabin.
Center gear down locks do not have a visual check. The uplock can be checked
with the center gear alternate extension handle.
An interlock prevents nuisance aural warnings during normal low thrust descents.
Brake System
There are two independent brake systems for each of the eight main wheels and
two center wheels. Each brake system uses a separate hydraulic system.
Brake system 1 is powered by hydraulic system 1. Brake system 2 is powered by
hydraulic system 3.
Both systems actuate brakes on all main and center gear wheels independently.
One brake system can provide braking for all landing conditions. Electric aux
hydraulic pump 1 can provide reserve pressure to hydraulic system 3 to power the
brakes. The pump switch is located on the AUTO BRAKE control panel and the
HYD control panel.
The hydraulic pressure available for each brake system is displayed on the AUTO
BRAKE control panel.
Brakes are available when the brake system pressure is above the red band on the
respective BRAKE PRESS indicator.
Three accumulators in each brake system will supply reserve braking pressure in
case of hydraulic system failure. Fully charged accumulators allow about 10
manual brake applications and will permit anti-skid operation.
Excessive brake temperature will melt a wheel fuse-plug, releasing tire pressure
at that wheel to protect against wheel failure.
Parking brakes are set by applying full braking pressure with the toe-operated
rudder pedal brakes, positioning the PARK BRAKE handle full aft, and then
releasing the rudder pedals. This traps braking pressure in the system.
Adequate parking brake pressure is available if the brake system BRAKE PRESS
indicators indicate pressure in the green band or higher.
With the parking brake set for several hours, hydraulic system pressure bleed off
can occur. Normal hydraulic pressure to the brakes is backed up by three
accumulators in each brake system. As long as the BRAKE PRESS indicators
show pressure, there will be hydraulic pressure at the brakes.
October 02, 2006
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