(b)
Landing Gear Door Hinges
(c)
Landing Gear Door Linkages
(d)
Landing Gear Door Linkage Supports
S 212-005
(2) Examine all other systems installations in the nose, wing, and body landing gear wheel wells for any signs of damage.
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747-400 MAINTENANCE MANUAL
WHEEL BEARING FAILURE/DAMAGE CONDITION - MAINTENANCE PRACTICES
______________________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General
_______
A. This inspection must be done before the next flight.
B. This section gives an inspection procedure for landing gear wheels, brakes, axle sleeves, and axles after a wheel bearing failure.
C. The degradation of wheel bearing components can occur as follows:
(1)
Lubrication that is incorrect or not sufficient
(2)
A decrease of the wheel bearing preload
(3)
Contamination in the bearings
(4)
Other damage that occurs.
D. When you operate with damaged bearings, it will cause heat in the adjacent parts.
(1)
Some of these parts are:
(a)
The axles
(b)
The axle sleeves
(c)
The spacers
(d)
The wheel hubs.
(2)
These parts can be scored if the bearing damage causes a seizure.
E. Make an inspection of the wheel bearings carefully during each tire change.
NOTE: Follow the wheel supplier's (Overhaul Manual) recommended
____
procedures.
TASK 05-51-17-212-001
2. Wheel Bearing Failure
_____________________
A. General
(1) The failure of a wheel bearing can be found by the symptoms or conditions that follow:
(a)
Contamination of the wheel bearing grease with unwanted material
(b)
Metal particles in the area of the wheel and the brake
(c)
The hubcap is damaged or is missing (main gear only)
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747-400 MAINTENANCE MANUAL
(d)
The brake cooling fan
(e)
The wheel is damaged
(f)
The wheel brake for the main landing gear is damaged
(g)
A wheel that is canted wheel more than usual
(h)
The wheel and tire assembly are missing.
B. Standard Tools and Equipment
WARNING: THE POWER CABLE OF THE BORESCOPE MUST BE IN A GOOD CONDITION.
_______ IF THERE ARE CIRCUMFERENTIAL CUTS, FRAYED AREAS, OR RUPTURES TO THE EXTERNAL RUBBER COVER OF THE CABLE, INJURY TO PERSONS CAN OCCUR.
(1)
Borescope - Fiber Optic Light Supply - Model
BLS-97, American Cystoscope Makers Inc.,
Industrial Division, Pelham, New York
(2)
Borescope - Fiber Optic Light Supply - Model
BLS-98, American Cystoscope Makers Inc.,
Industrial Division, Pelham, New York
(3)
Rigid Borescope - Model BFO-3920A, American
Cystoscope Makers Inc., Industrial Division,
Pelham, New York
(4)
Flexible Borescope - Model BF1F-3127DD,
Cystoscope Makers Inc., Industrial Division,
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