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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
5. Operation
_________
A. Functional Description
(1)
When the control handle is pulled out, the inner end is raised from a detent to free the lever for movement to another position. Moving the lever up or down rotates a quadrant which operates cables connected to the wing gear selector valve and to the body and nose gear selector valve. Cable movement operates the selector valves which pressurize the landing gear hydraulic systems. Releasing the control handle when the desired position has been selected allows the lever to drop into a detent. This holds the lever in the position selected. In the DN position, the handle operates the gear down indicator switches which provide inputs to the indicating and warning system.
(2)
If conditions are not right for gear retraction, the control handle is blocked from inadvertent movement to UP by a lever attached to a lock solenoid. When the wheels on all main gear are tilted and body gear steering actuators locked, the solenoid is energized, pulling the lever away and unblocking the handle. The solenoid remains energized while the gear is up (or gear down with wheels tilted) and electrical power is on the airplane.
B.
Control
(1)
The control handle is pulled out and raised or lowered to the UP or DN position as required. The lock lever may be manually moved aside for tests, or in emergencies, by depressing the lock overide button. The lock overide feature should not be used with the airplane on the ground unless all landing gear ground lockpins are installed. Otherwise an inadvertent retraction of the landing gear could occur.
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747-400 FAULT ISOLATION/MAINT MANUAL
LANDING GEAR CONTROL SYSTEM
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE
CABLES - CONTROL SYSTEM 1 10 WELLS IN L, R BODY LANDING GEAR WHEEL CONTROL CABIN TO SELECTOR VALVES 32-31-00
CIRCUIT BREAKERS - 1 FLT COMPT, P7
LANDING GEAR LEVER LOCK, C01435 1 7F24 *
MODULE - CONTROL HANDLE 1 1 FLT COMPT, P2-3 32-31-01
QUADRANT - NOSE/BODY GEAR SELECTOR VALVE 3 1 L BODY GEAR WHEEL WELL, NOSE/BODY SELECTOR VALVE MECHANISM 32-31-04
QUADRANT - WING GEAR SELECTOR VALVE 3 1 R BODY GEAR WHEEL WELL, WING GEAR SELECTOR VALVE MECHANISM 32-31-04
RELAY - INTERLOCK, R391 2 1 FLT COMPT, P2-3, LANDING GEAR CONTROL HANDLE MODULE *
SOLENOID - INTERLOCK, M926 2 1 FLT COMPT, P2-3 *
SWITCH - GEAR DOWN INDICATOR, S753A,S753B 2 1 CONTROL HANDLE MODULE FLT COMPT, P2-3, LANDING GEAR *
VALVE - NOSE/BODY GEAR SELECTOR 3 1 L BODY GEAR WHEEL WELL, NOSE/BODY GEAR SELECTOR VALVE MECHANISM 32-31-03
VALVE - WING GEAR SELECTOR 3 2 SELECTOR VALVE MECHANISMR BODY GEAR WHEEL WELL, WING GEAR 32-31-03
* SEE WM EQUIPMENT LIST
Landing Gear Control System - Component Index
Figure 101
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