S 216-018
(2)
Examine the bearing or bushing to see if it turns in the housing or for fretting on the surfaces without the lining.
NOTE: If the bearing or bushing turns in the housing, you must
____ measure the dimensions to make sure it is not too worn.
S 216-006
(3) Manually turn the bearings and feel for signs that it is too rough, too loose, has too much drag or unusual drag.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-21-02
ALL ú ú 01 Page 602 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 216-007
(4) Do a check of the bearing lining:
NOTE: On most spherical bearings, you can turn the ball and look at
____ the lining through the bearing bore.
(a)
Examine the lining for worn areas.
1) Usually, reject bearings and bushings that have internal diameterical play of 0.010 inch. But, use service experience and the applicable permitted wear limits to know if the part is serviceable.
(b)
Examine the lining load pattern.
1) Examine the surface where the lining and ball/pin touch. Make sure all of the surface has an equal load.
NOTE: Incorrect swaging during manufacture or installation
____ can cause the edges of the lining to wear too much. These bearings and bushings are not serviceable.
(c)
Examine the lining for unwanted material.
1) Examine the lining to make sure that no unwanted material became attached.
(d)
Examine the lining for chemical deterioration.
1) Examine the lining and lining bond for signs of chemical damage.
S 216-008
(5) Do the Bearing/Bushing - Inspection/Check (Bench Check) task.
TASK 20-21-02-206-009
3. Special Bearing and Bushing Configurations Inspection/Check
___________________________________________________________
A. Procedure - Special Bearing and Bushing Configurations - Check
S 216-010
(1)
Examine aluminum bearing races for serviceable surface treatment or plating, and for corrosion and cracks.
S 216-011
(2)
Examine special configuration bearings with threads, holes, keyways, flanges, or equivalent properties for cracks in these areas.
NOTE: These special configurations can cause stress risers in these
____
areas.
S 216-012
(3) Do the Bearing/Bushing - Inspection/Check (Bench Check) task.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
20-21-02
ALL ú ú 01 Page 603 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 20-21-02-206-013
4. Bushings and Bearings (Bench Check) - Inspection/Check
______________________________________________________
A. General
(1)
Before you do this task, do the procedure - Check of Self-Lubricated Bearings and Bushings (Bench Check) in the first task.
B.
Procedure - Wear Check
S 226-014
(1) To determine the amount of bearing wear, manually apply a reversing load to bearing in a simple holding fixture and measure play with a dial indicator. Radial wear should be measured by applying a reversing radial load of 10 to 15 pounds and total diametrical play measured. A reversing load of the same magnitude should then be applied in an axial (thrust) direction and axial play measured.
NOTE: When measuring play in the radial direction, several points
中國(guó)航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊(cè) STANDARD PRACTICES - AIRFRAME(97)
