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* Lock actuator
* Transfer cylinder
* Valve manifold.
Extension
The landing gear selector valve supplies down pressure when
the landing gear lever is in the down position. A rate fuse (in the
MLG wheel well forward bulkhead) in the down pressure line
closes when the hydraulic flow increases to 10 gpm (38 lpm).
This prevents hydraulic fluid loss if there is a leak in the system.
This rate fuse in the down pressure line permits a variable
amount of fluid for nose wheel steering.
Down pressure goes to the transfer cylinder. This sets the
piston in the transfer cylinder to move to the up side. This gives
a time delay to let the lock actuator unlock the lock mechanism.
Down pressure also goes to the lock actuator. The lock actuator
extends to unlock the lock mechanism.
When the transfer cylinder piston gets to the end of the up side,
down pressure goes to the down side of the gear actuator. The
gear actuator applies an extension force on the nose landing
gear and moves it down.
As the nose landing gear moves to the down and locked
position, the lock actuator again extends with down pressure to
lock the lock mechanism.
Retraction
The landing gear selector valve supplies up pressure when the
landing gear lever is in the up position. A volume fuse (in the
NLG wheel well) in the up pressure line closes when the
hydraulic flow increases to 100-140 cubic inches (1.6-2.3 liters).
This prevents hydraulic fluid loss if there is a leak in the system.
A flow limiter in the up pressure line limits the flow to the nose
landing gear actuator to 3 gpm (11 lpm). The flow limiter makes
sure hydraulic system pressure stays normal for other airplane
systems that also use hydraulic pressure. The flow limiter also
controls the transfer cylinder rate and the nose landing gear
extension and retraction rate.
Up pressure goes to the transfer cylinder. This moves the piston
in the transfer cylinder to the down side. This gives a time delay
to let the lock actuator unlock the lock mechanism.
NLG EXTENSION AND RETRACTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Up pressure also goes to the lock actuator. The lock actuator
retracts to unlock the lock mechanism.
When the transfer cylinder piston gets to the end of the down
side, up pressure goes to the up side of the gear actuator. The
gear actuator applies a retraction force on the nose landing
gear and moves it up.
As the nose landing gear moves to the up and locked position,
the lock actuator again retracts. This occurs with up pressure to
lock the lock mechanism.
Nose Wheel Steering
The nose wheel steering system receives pressure when the
landing gear selector valve moves to the down position.
See the Nose Wheel Steering section for more information
about nose wheel steering. (SECTION 32-51)
NLG EXTENSION AND RETRACTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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NLG EXTENSION AND RETRACTION - FUNCTIONAL DESCRIPTION
NLG EXTENSION AND RETRACTION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The main landing gear manual extension system lets you lower
the left and right main landing gear from the up and locked
position. You use the MLG manual extension system when
hydraulic system A pressure fails or if normal extension fails.
Components
These are the main landing gear manual extension system
components:
* Control mechanism
* Extension linkage
* Control cables (not shown).
General Description
The main landing gear manual extension system operates
independently of the normal extension and retraction system.
Pull on either the right main or left main gear manual extension
handles in the manual extension control mechanism to operate
the system. The handles pull on the right or left MLG manual
　
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