S 712-008
(2)
Make sure the brakes will release correctly (AMM 32-42-00).
S 212-009
(3)
Make sure that the hydraulic return filters are not blocked
(AMM 29-11-13/401, and 29-11-15/401).
S 212-010
(4)
Make sure the routing of the hydraulic lines and the wiring runs are correct.
S 712-011
(5)
Do the transducer spin test to make sure that the correct brake will release when the transducer motion is stopped (AMM 32-42-00).
S 712-012
(6)
Make sure the parking brake valve operates correctly. Also make sure that the valve is fully open when the parking brake is released (AMM 32-44-00).
S 742-013
(7)
Do a BITE test for the Antiskid/Autobrake system. Make sure the system has continuity (AMM 32-42-00).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
WHEEL BEARING FAILURE/DAMAGE CONDITION (CONDITIONAL INSPECTION) -
_______________________________________________________________ MAINTENANCE PRACTICES
_____________________
1. General_______
A. This section gives an inspection procedure for landing gear wheels, brakes, axle sleeves, and axles after a wheel bearing failure.
B. The degradation of wheel bearing components can occur as follows:
(1)
Lubrication that is incorrect or not sufficient
(2)
A decrease of the preload
(3)
Unwanted material in the bearing
(4)
Other damage that occurs.
C. When you operate with damaged bearings, it will cause too much heat in the adjacent parts. Some of these parts are:
(1)
The axles
(2)
The axle sleeves
(3)
The spacers
(4)
The wheel hubs.
D. These parts can be scored if the bearing damage causes a seizure and causes rotation that is relative to the adjacent parts.
E. Make an inspection of the wheel bearings carefully each tire change as shown in the wheel vendor's 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 or fragments in the area of the wheel and the brake
(c)
The hubcap is damaged or not there (main gear only)
(d)
A wheel that is canted more than the specifications permit
(e)
The wheel and tire assembly are not there.
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
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05-51-17
ALL ú ú 01 Page 201 ú May 28/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(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
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