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NLG Doors
Two doors aerodynamically seal the nose landing gear wheel
well to decrease drag. The doors attach to the outboard edges
of the nose landing gear wheel well. The doors connect to the
shock strut and move mechanically when the nose landing gear
extends or retracts.
NOSE LANDING GEAR AND DOORS - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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NOSE LANDING GEAR AND DOORS - GENERAL DESCRIPTION
NOSE LANDING GEAR AND DOORS - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 32-20-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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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THIS PAGE IS INTENTIONALLY LEFT BLANK
NOSE LANDING GEAR AND DOORS - GENERAL DESCRIPTION
32-20-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
Purpose
The nose landing gear shock strut is an air-oil shock absorber.
It has an inner cylinder that moves in an outer cylinder. The
seals provide an air-oil seal between the two cylinders.
Location
A static and a dynamic seal between the inner and outer
cylinders keep the mixture of nitrogen and hydraulic fluid in the
shock strut.
Physical Description
The seals are an elastomer type seal.
Functional Description
There are spare static and dynamic seals in the shock strut.
These spare seals let you remove and replace defective seals
without removal of the inner cylinder.
The upper bearing carrier (not shown) and the lower bearing
carrier hold the active and spare seals.
The excluder ring (O-ring) seal protects the spare seals from
external contamination and ozone damage.
The scraper ring protects the inner and outer strut components
from unwanted material.
The gland nut and retainer bolt hold the lower bearing carrier.
Training Information Point
Use plastic tools when you remove or install the shock strut
seals to prevent damage to the inner cylinder.
Measure the distance the gland nut extends below the outer
cylinder before and after you remove and install the gland nut. If
the distance is larger after installation than it was before, there
is an obstruction that prevents proper gland nut installation.
WARNING: DO NOT LOOSEN THE VALVE BODY UNLESS THE
SHOCK STRUT IS FULLY DEFLATED. AIR
PRESSURE CAN BLOW THE VALVE BODY OUT,
AND CAN CAUSE INJURY TO PERSONS.
WARNING: THE CHARGING VALVE MUST STAY OPEN.
INTERNAL PRESSURE CAN BLOW OUT THE
GLAND NUT AND CAN CAUSE INJURY TO
PERSONS.
WARNING: WHEN AN AIRPLANE LOWERS RAPIDLY, IT CAN
CAUSE INJURY TO PERSONS AND DAMAGE TO
EQUIPMENT.
NOSE LANDING GEAR AND DOORS - SHOCK STRUT SEALS
EFFECTIVITY
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32-20-00-002
CAUTION: YOU MUST BE VERY CAREFUL NOT TO CAUSE
DAMAGE TO THE INNER CYLINDER. NICKS OR
SCRATCHES ON THE INNER CYLINDER WILL
CAUSE DAMAGE TO THE CENTERING CAM AND
THE SEALS. THIS DAMAGE WILL OCCUR AS THE
SEALS MOVE OVER THE DAMAGED SURFACE OF
THE INNER CYLINDER.
CAUTION: HAVE EQUIPMENT OR PERSONNEL READY TO
SUPPORT THE WEIGHT OF THE INNER CYLINDER
AS THE CYLINDER COMES OUT. THE INNER
CYLINDER CAN BE DAMAGED IF YOU DROP IT.
CAUTION: THE GLAND NUT AND THE OUTER CYLINDER
MAY HAVE BEEN REWORKED (OVERSIZE). MAKE
SURE YOU IDENTIFY THEM AS REWORKED
(OVERSIZE) AND KEPT AS A SET.
CAUTION: DO NOT APPLY VASELINE OR PETROLATUM TO
THE SEALS BECAUSE THIS CAN CAUSE TOO
MUCH SWELLING OF THE SEAL MATERIAL.
NOTE: Make sure your hands are clean when you handle the
elastomer seals. Some greases can cause the
elastomer seals to swell too much. This can cause
the seals to leak.
NOSE LANDING GEAR AND DOORS - SHOCK STRUT SEALS
EFFECTIVITY
GUN ALL 32-20-00
Page 8
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-20-00-002
NOSE LANDING GEAR AND DOORS - SHOCK STRUT SEALS
NOSE LANDING GEAR AND DOORS - SHOCK STRUT SEALS
EFFECTIVITY
GUN ALL 32-20-00
Page 9
D633A101-GUN Feb 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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