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MLG MANUAL EXTENSION SYSTEM - MLG EXTENSION LINKAGE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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MLG MANUAL EXTENSION SYSTEM - MLG EXTENSION LINKAGE
MLG MANUAL EXTENSION SYSTEM - MLG EXTENSION LINKAGE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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General
The access door position switch in the manual extension control
mechanism sends a signal to the manual extend solenoid valve
in the landing gear selector valve. This moves the bypass valve
in the landing gear selector valve to connect all hydraulic
components in the landing gear system to the hydraulic system
return.
Functional Description
When you open the access door to the manual extension control
mechanism, an access door position switch closes. The
position switch sends 28v dc from the battery bus to the
manual extend solenoid valve in the landing gear selector
valve. The manual extend solenoid valve commands the bypass
valve in the selector valve to move to the bypass position.
See the main landing gear extension and retraction section for
more information about the landing gear selector valve.
(SECTION 32-32)
MLG MANUAL EXTENSION SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
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MLG MANUAL EXTENSION SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
32-35-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The nose landing gear manual extension system lets you lower
the nose landing gear from the up and locked position. You use
the NLG manual extension system when hydraulic system A
pressure fails or if normal extension fails.
Components
These are the nose landing gear manual extension system
components:
* Release mechanism
* Control cable (not shown).
General Description
The nose gear manual extension system operates
independently of the normal extension and retraction system.
Pull on the nose gear manual extension handle in the manual
extension control mechanism to operate the system. This pulls
the control cable and turns the release mechanism.
When the release mechanism turns, it moves the nose landing
gear lock link to the released position. The nose landing gear
extends by airloads and its own weight.
When you open the access door to the manual extension control
mechanism, an access door position switch sends a signal to
the manual extend solenoid valve in the landing gear selector
valve. This moves the bypass valve in the landing gear selector
valve to connect all the hydraulic components in the normal
landing gear extension and retraction system to the hydraulic
system return.
NLG MANUAL EXTENSION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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NLG MANUAL EXTENSION SYSTEM - GENERAL DESCRIPTION
NLG MANUAL EXTENSION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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Purpose
The NLG manual extension release mechanism moves the NLG
lock mechanism to the released position. This lets the NLG
extend by airloads and gravity.
Location
The release mechanism is on the upper bulkhead of the nose
landing gear wheel well.
Physical Description
The release mechanism has these components:
* Quadrant
* Cam
* Cam roller
* Release roller.
　
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