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extension system control cable which goes to the right or left
MLG manual extension linkage.
Each MLG manual extension linkage moves the uplock
mechanism for that main landing gear to the unlocked
position. The main landing gears extend by airloads and their
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.
MLG MANUAL EXTENSION SYSTEM - GENERAL DESCRIPTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
32-34-00-001
MLG MANUAL EXTENSION SYSTEM - GENERAL DESCRIPTION
MLG MANUAL EXTENSION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-34-00
Page 3
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-34-00-001
Purpose
The manual extension control mechanism transmits inputs from
the flight compartment to the release mechanism of the nose
landing gear and extension linkages of the main landing gears.
Location
The manual extension control mechanism is below the flight
compartment floor. You get access to the manual extension
control mechanism handles through an access door in the floor
of the flight compartment aft of the control stand.
Physical Description
There are three manual extension handles. One is for the nose
landing gear and one for each main landing gear. They let you
operate the manual extension system for each gear. The
handles connect to cables that go to cable quadrants.
Functional Description
Manual extension control cables go from each cable quadrant
to the release mechanism of the nose landing gear and the
extension linkages of the right and left main landing gear.
When you open the access door to the manual extension control
mechanism, an access door position switch sends a signal to
the bypass valve on the landing gear selector valve. The bypass
valve moves to the bypass position. This makes sure the
landing gear hydraulic components are connected to the
hydraulic system return. This prevents a hydraulic lock which
may not permit manual extension of the landing gear.
Operation
Pull the right or the left main gear manual extension handles in
the manual extension control mechanism to operate the
system. This pulls the right or left MLG manual extension
cables which go to the right or the left MLG manual extension
linkages.
CAUTION: DO NOT HOLD THE MANUAL EXTENSION HANDLE
IN ANY EXTENDED POSITION DURING
HYDRAULIC OPERATION OF THE LANDING GEAR.
MLG MANUAL EXTENSION SYSTEM - CONTROL MECHANISM
EFFECTIVITY
GUN ALL 32-34-00
Page 4
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-34-00-002
MLG MANUAL EXTENSION SYSTEM - CONTROL MECHANISM
MLG MANUAL EXTENSION SYSTEM - CONTROL MECHANISM
EFFECTIVITY
GUN ALL 32-34-00
Page 5
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-34-00-002
Purpose
The MLG manual extension linkage moves the uplock
mechanism to the unlocked position. This lets the MLG
extend by gravity during manual extension.
One MLG manual extension linkage operates for each main
landing gear.
Location
The MLG manual extension linkage is on the upper bulkhead of
the main landing gear wheel well above the uplock mechanism.
Physical Description
The MLG manual extension linkage includes these
components:
* Quadrant
* Return spring
* Control rod
* Lever
* Upper lock link and tabs
* Lower lock link.
Functional Description
When you pull the main landing gear manual extension handle
in the flight compartment, the control cable turns the quadrant in
the extension linkage. This pulls the control rod and turns the
lever. The lever moves the uplock mechanism (upper and lower
lock links) by the upper lock link tabs to the unlocked position.
When you release the manual extension handle, the return
spring moves the extension linkage to the normal position.
　
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