MD-11 Flight Crew Operations Manual
k
Landing Gear and Brakes -
Controls and Displays
Land.30.3
2. GEAR Handle
Mechanically positions landing gear hydraulic control valve for retraction or
extension of landing gear. To move handle from UP or DOWN it must be
pulled aft. An interlock prevents moving GEAR handle to UP if hydraulic
pressure to landing gear trim system fails. A force of 160 pounds may be
applied to GEAR handle without causing damage to system.
Failure of the landing gear trim system prevents moving the GEAR handle to
UP.
3. CTR GEAR NORM/UP Isolation Switch - blue
Permits main gear to be extended without extending center gear.
UP prevents center gear from extending when main gear is extended. Center
gear warning circuits are inhibited.
If switch is not illuminated, center gear will extend and retract when main
gear extends and retracts by means of gear handle. If switch is illuminated,
the center gear remains retracted regardless of GEAR handle position.
4. HANDLE REL Button
Releases anti-retraction mechanism and permits gear handle to be placed in
UP in event of ground sensing release mechanism malfunction.
5. GEAR HORN OFF Button
When pushed, will silence gear warning horn when flaps are not in landing
range and landing gear is up.
October 02, 2006
To Next Page