MD-11 Flight Crew Operations Manual
k
Landing Gear and Brakes Chapter Land
Description and Operation Section 10
Land.10.1
Land.10 Landing Gear and Brakes-Description and Operation
General
The aircraft has a tricycle landing gear consisting of four-wheel trucks on each
main gear, dual wheels on the nose gear, and a dual wheel center gear. Maximum
tire speed is 204 KTS.
All landing gear as well as the main gear wheelwell doors are hydraulically
actuated. The main and nose gear can be extended without extending the center
gear. A free fall capability is designed into the system for use in case of hydraulic
failure.
An electrically monitored, visual/aural indicating and warning system provides
gear status indications during the various flight phases.
Dual, hydraulic powered, multi-disk wheel brakes with anti-skid control systems
are installed on the main and center gear.
Hydraulic accumulators provide reserve brake pressure in case of normal
hydraulic pressure loss.
Tire pressure and brake temperature are monitored continuously and displayed on
the CONFIGURATION page of the System Display (SD).
Alerts on the Engine and Alert Display (EAD) and SD will warn the flight crew
of anti-skid, brake, and tire malfunctions.
Gear Retraction and Extension
The landing gear and main doors are retracted and extended by hydraulic system
3. If system 3 has a pressure loss, but fluid is available, hydraulic power to retract
the gear can be supplied if either the (1-3) or (2-3) Reversible Motor Pumps
(RMP) are operating.
HYD SYS 3 hydraulic quantity indication will show a slight increase when the
gear is retracted.
If no hydraulic pressure is available due to loss of fluid or complete system failure,
or if the GEAR handle is jammed in the up position, the main and nose gear can
be mechanically unlatched by an alternate gear extension lever in the floor at the
right side of the pedestal. The center gear can be unlatched by a center gear
alternate extension handle on the cockpit floor. All landing gear will then free fall
and mechanically latch in the down position. The main landing gear is normally
held in the up position by hydraulic pressure. In case of pressure loss, the main
gear will rest on the main wheelwell doors. The nose gear and center gear are held
up by overcenter linkage.
October 02, 2006
To Next Page
Loading...