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Remove the outer door when you remove and install the main
landing gear actuator. This makes access to the actuator
easier.
MLG EXTENSION AND RETRACTION - MAIN LANDING GEAR ACTUATOR
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-32-00-003
MLG EXTENSION AND RETRACTION - MAIN LANDING GEAR ACTUATOR
MLG EXTENSION AND RETRACTION - MAIN LANDING GEAR ACTUATOR
EFFECTIVITY
GUN ALL 32-32-00
Page 7
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-32-00-003
Purpose
The MLG uplock mechanism holds the main landing gear in the
up and locked position.
The MLG uplock actuator unlocks the MLG uplock mechanism
during main landing gear extension.
Location
There are two MLG uplock mechanisms, one for each MLG, on
the ceiling on the outboard edges of the main landing gear
wheel well.
The MLG uplock actuators attach horizontally above the MLG
uplock mechanisms.
Physical Description
The MLG uplock actuator is a two-position, piston-type, singleacting,
unbalanced-type actuator.
The main landing gear uplock mechanism has these main
components:
* Uplock hook
* Springs (2)
* Uplock actuator.
Functional Description
Extend hydraulic pressure to the MLG uplock actuator controls
movement of the MLG uplock mechanism to the unlocked
position.
The MLG uplock actuator does not receive up pressure during
landing gear retraction.
The MLG uplock mechanism uses over-center locking to keep
the main landing gear up and locked. Two springs hold the
uplock hook in the up and locked position.
Training Information Point
After removal and installation of the uplock actuator, you must
extend and retract the main landing gear several times. This
operation will bleed the air from the uplock actuator and the
lines. Examine for correct gear operation.
MLG EXTENSION AND RETRACTION - UPLOCK MECHANISM AND ACTUATOR
EFFECTIVITY
GUN ALL 32-32-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-32-00-004
MLG EXTENSION AND RETRACTION - UPLOCK MECHANISM AND ACTUATOR
MLG EXTENSION AND RETRACTION - UPLOCK MECHANISM AND ACTUATOR
EFFECTIVITY
GUN ALL 32-32-00
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-32-00-004
General Description
The MLG uplock mechanism uses over-center locks to keep the
main landing gear up and locked.
The MLG uplock actuator retracts to unlock the main landing
gear.
Main Landing Gear Extension
During main landing gear extension, the MLG uplock actuator
receives down pressure to retract. The actuator moves the
uplock mechanism to the unlocked position.
Main Landing Gear Retraction
During main landing gear retraction, the roller on the MLG
shock strut engages the uplock hook, this moves the uplock
mechanism to the over-center and locked position. Lock springs
hold the mechanism in the up and locked position.
The restrictor in the down port of the actuator slows the
movement of the uplock mechanism when the roller moves into
the uplock hook. The restrictor reduces flow to .41 gpm at 3000
psi.
MLG EXTENSION AND RETRACTION - UPLOCK MECHANISM AND ACTUATOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-32-00
Page 10
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-32-00-005
MLG EXTENSION AND RETRACTION - UPLOCK MECHANISM AND ACTUATOR - FUNCTIONAL DESCRIPTION
MLG EXTENSION AND RETRACTION - UPLOCK MECHANISM AND ACTUATOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-32-00
Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-32-00-005
General
The MLG downlock mechanism holds the main landing gear in
the down and locked position.
The downlock springs hold the downlock mechanism in an
over-center locked position when the main landing gear moves
to the down and locked position.
The downlock actuator locks and unlocks the downlock
　
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