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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-20-00-002
Purpose
Two nose landing gear doors aerodynamically seal the nose
gear wheel well to decrease drag.
Location
The doors attach to the outboard edges of the nose landing gear
wheel well with hinges.
Physical Description
The nose landing gear doors are made of composite materials.
Functional Description
Control rods and bellcranks connected to the top of the shock
strut move the doors mechanically with the nose landing gear
during extension and retraction. When the gear extends, the
doors open. When the gear retracts, the doors close.
Training Information Point
The NLG doors are rigged in the door closed position with a
pre-load on the forward door operating rod. The pre-load
prevents door movement away from the door stops due to
dynamic pressures in flight.
CAUTION: MAKE SURE THAT THE WHEEL WELL DOORS DO
NOT TOUCH THE STEERING ACTUATORS ON THE
NOSE GEAR WHILE THE GEAR EXTENDS AND
RETRACTS. THIS CAN OCCUR IF THE DOORS ARE
NOT ADJUSTED CORRECTLY AND CAN CAUSE
DAMAGE TO THE DOORS.
NOSE LANDING GEAR AND DOORS - NOSE LANDING GEAR DOORS
EFFECTIVITY
GUN ALL 32-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
32-20-00-003
NOSE LANDING GEAR AND DOORS - NOSE LANDING GEAR DOORS
NOSE LANDING GEAR AND DOORS - NOSE LANDING GEAR DOORS
EFFECTIVITY
GUN ALL 32-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
32-20-00-003
General
The nose landing gear shock strut uses hydraulic fluid and
compressed dry air or nitrogen to control the shock strut action.
The gas charging valve lets you pressurize the shock strut. The
oil charging valve permits hydraulic servicing of the shock strut.
The gas charging valve is on the top of the nose landing gear
shock strut.
The oil charging valve is on the aft side of the nose landing gear
shock strut.
See the maintenance manual, servicing, for more information
about servicing the main landing gear shock strut.
Training Information Point
Obey this warning when you deflate the shock strut:
WARNING: CLEAR THE AREA BELOW THE WING BEFORE
YOU DEFLATE THE SHOCK STRUT. IF YOU
DEFLATE THE SHOCK STRUT, THE WING TIP
CAN MOVE DOWN AND CAN CAUSE INJURY TO
PERSONS OR DAMAGE TO EQUIPMENT.
NOTE: Fluid in the shock strut will have bubbles when you
release the pressure. Deflate the shock strut slowly to
prevent the leakage of the fluid through the gas valve.
Obey this warning when you remove the air valve body on the
shock strut:
WARNING: DO NOT REMOVE THE VALVE BODY UNLESS YOU
DEFLATE THE SHOCK STRUT FULLY. THE AIR
PRESSURE CAN BLOW THE VALVE BODY OUT
AND CAUSE INJURY TO PERSONS.
NOSE LANDING GEAR AND DOORS - SHOCK STRUT - TRAINING INFORMATION POINT - 1
EFFECTIVITY
GUN ALL 32-20-00
Page 12
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-20-00-004
NOSE LANDING GEAR AND DOORS - SHOCK STRUT - TRAINING INFORMATION POINT - 1
NOSE LANDING GEAR AND DOORS - SHOCK STRUT - TRAINING INFORMATION POINT - 1
EFFECTIVITY
GUN ALL 32-20-00
Page 13
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-20-00-004
General
The servicing chart is on the left side wall of the nose landing
gear wheel well.
Use BMS 3-32 Tyoe II landing gear shock strut fluid when you
add fluid to the shock strut. BMS 3-32 Type II fluid is a mixture of
MIL-H-5606 hydraulic fluid and additives.
You measure dimension X from the top of the nose landing gear
tow fitting to the bottom of the lower steering plate.
See the maintenance manual, servicing, for more information
about servicing the main landing gear shock strut.
Training Information Point
Release all air from the shock strut before you add shock strut
fluid.
CAUTION: USE ONLY THE TYPE OF FLUID WHICH IS
SPECIFIED IN THE TASK TO FILL THE SHOCK
STRUT. IF AN INCORRECT FLUID IS USED, IT CAN
CAUSE DAMAGE TO THE SEALS.
NOTE: It is optional to use fluid, MIL-H-5606 or fluid, MIL-PRF-
6083 (NATO C-635) and add lubricant, lubrizol 1395 in a
ratio of 41:1.
CAUTION: CLEAN ALL THE LEAKED HYDRAULIC FLUID
　
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