S 862-026
(10)
Set the system select switch on the data loader control panel to NORMAL.
S 412-027
(11)
Close the front cover on the ADL.
S 742-028
(12)
Make sure that the correct software part numbers are installed in the component.
NOTE: The software installation task for the component has the
____ steps to do a software configuration check.
S 862-029
(13) Remove electrical power (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
SELF-LUBRICATED BEARINGS AND BUSHINGS - INSPECTION/CHECK
________________________________________________________
1. General_______
A. This procedure contains three tasks:
(1)
The first task has two inspection/check procedures of bearings and bushings. One procedure is for bearings and bushing that are installed on the airplane. The other procedure is when the bearings and bushing are on the bench.
(2)
The second is an inspection/check of special bushing and bearing configurations. Special bushings and bearings are those with holes, keyways, flanges, threads or other special properties.
(3)
The third is an inspection/check of bushings and bearings (bench check). Do this task after you have done the bench test instructions from the first task. This task gives steps to do a check of the breakaway torque of spherical bearings.
B. You can examine the self-lubricated (teflon-cloth lining) bearings and bushings on the airplane, or removed (bench check). The recommended procedure is the bench check. During the bench check you fully examine the parts for signs of damage from corrosion or cracks. Also, you can do a torque check of the bearing inner race.
TASK 20-21-02-206-001
2. Bearings and Bushings - Inspection/Check________________________________________
A. Procedure - Check of Self-Lubricated Bearings and Bushings (Installed on the Airplane)
S 216-019
CAUTION:_______DO NOT LUBRICATE TEFLON BEARINGS. TEFLON BEARINGS ARE SELF-LUBRICATED. GREASE OR OTHER LUBRICANTS CAN CAUSE LINING DETERIORATION.
(1) Examine the bearings or bushings to make sure they are not too worn or too loose as follows:
NOTE: If you find more than 0.010-inch internal diametrical play,
____ you must carefully examine the bearings or bushings. Reject a bearing that has signs of galling of the bearing surfaces. If there is play but not galling, then examine the parts for a failure condition given at each maintenance inspection. These bearings and bushings do not always have noise when they are loose.
(a) Try to move and turn the assembly to make sure the bearing or bushing is not too worn.
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747-400 MAINTENANCE MANUAL
(b)
Make sure the bearing is not loosely held by its housing or turns in it housing.
(c)
Make sure there is not damage, cracks or too much corrosion on the bearing or housing.
S 216-003
(2) If you can turn the bearing, or if removal of bolts permits you to turn the bearing, do the steps that follow:
NOTE: If you can see the lining after bolt removal, refer to the
____ bench check instructions and examine the lining material.
(a)
Turn the bearing without a load on the bearing.
1) Make sure it is not too worn, is rough, or has too much drag.
(b)
Turn the bearing while you apply a load.
1) Make sure it is not too worn, is rough, or has too much drag.
S 216-004
(3) Examine the bearings and bushings to make sure there is not lining material that comes out of the housing too far.
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