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* BMS - Boeing material specification
* BMV - brake metering valve
* DC - direct current
* ext - extend
* flt dk - flight deck
* GRD - ground
* gpm - gallons per minute
LANDING GEAR - INTRODUCTION
EFFECTIVITY
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* hyd - hydraulic
* inbd - inboard
* inop - inoperative
* LG - landing gear
* lpm - liters per minute
* MLG - main landing gear
* max - maximum
* NLG - nose landing gear
* norm - normal
* NWS - nose wheel steering
* outbd - outboard
* P - pressure
* pri - primary
* PSEU - proximity switch electronics unit
* PSI - pounds per square inch
* qty - quantity
* RTO - rejected takeoff
* sec - secondary
* sol - solenoid
* sw - switch
* sys - system
* vlv - valve
* ww - wheel well
* xfr - transfer
* xmtr - transmitter
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The 737 airplane has a tricycle type landing gear with air/oil
shock struts.
These are the landing gear structural systems:
* The main landing gear (MLG) and doors (32-10)
* The nose landing gear (NLG) and doors (32-20).
The landing gear extension and retraction systems extend and
retract the main and nose landing gear (32-30).
The nose wheel steering system supplies the ground
directional control of the airplane (32-50).
Components
The landing gear system has these main components:
* Control lever assembly
* Manual extension mechanism
* Transfer valve
* Selector valve
* Main landing gear (2)
* Nose landing gear
* Shimmy damper
* Proximity switch electronics unit (PSEU)
* Landing gear panel
* Auxiliary landing gear position lights.
General Description
Hydraulic system A normally supplies pressure to the landing
gear extension and retraction. Hydraulic system B supplies
pressure for retraction only.
The landing gear transfer valve receives electrical signals from
the proximity switch electronics unit (PSEU). The landing gear
transfer valve changes the pressure source of the landing gear
from hydraulic system A to hydraulic system B.
See the Air/Ground System section for more information about
the proximity switch electronics unit (PSEU). (SECTION 32-09)
You move the landing gear control lever assembly to control
landing gear extension and retraction. The control lever moves
the selector valve through cables.
The selector valve also gets an electrical input from the manual
extension system. This operates a bypass valve in the selector
valve to connect the landing gear retraction to the hydraulic
system return. This lets the manual extension system extend
the landing gear.
Landing gear lights show the position of the landing gear. The
PSEU receives landing position signals from sensors on the
landing gear. The normal and auxiliary lights are controlled by
the PSEU.
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EFFECTIVITY
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