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TASK 72-58-45-200-801
1 . General.
  A.This procedure gives instructions to do an inspection of the No. 4 bearing aft rotating seal (aft rotating seal) (35-380 , 72-00-02) (SIN 01406).
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
70-32-02
Fluorescent-Penetrant Inspection
 
70-42-00
Blending and Removal of High Metal Procedures
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
Subtask 72-58-45-230-001
A.Do a Class G fluorescent-penetrant inspection, with Class A acceptability limits, of the aft rotating seal. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION).
4 . Visual Inspection.
Refer to Figure 801.
Subtask 72-58-45-220-003
A.Do an inspection of all areas (does not include the coating) of the aft rotating seal for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the aft rotating seal.
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Figure 801   No. 4 Bearing Aft Rotating Seal - Inspection
Subtask 72-58-45-220-004
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
0.020 inch (0.51 mm) after removal of high metal. Refer to TASK 70-42-00-350-002 (70-42-00 Blending and Removal of High Metal Procedures).
Repair method:
Replace the aft rotating seal.
Subtask 72-58-45-220-005
B.Do an inspection of the coating in area L for:
(1)Rubs or grooves:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-45-300-801 (72-58-45, REPAIR 002) .
Subtask 72-58-45-220-006
(2)Missing coating:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-58-45-300-801 (72-58-45, REPAIR 002) .
Subtask 72-58-45-220-020
(3)Discoloration:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the aft rotating seal.
5 . Dimensional Inspection.
Refer to Figure 801.
Subtask 72-58-45-220-007
A.Measure the diameters at eight equally-spaced locations. Calculate the average diameter dimension. Compare the average diameter to the dimensions given in Subtask 72-58-45-220-010 (paragraph 5.D.).
Subtask 72-58-45-220-008
B.Measure diameter B in the free state.
Subtask 72-58-45-220-009
C.Measure all of the remaining dimensions with diameter B held to the serviceable limits in Subtask 72-58-45-220-010 (paragraph 5.D.) and surface A flat to not more than 0.001 inch (0.02 mm).
Subtask 72-58-45-220-010
D.Do an inspection of the aft rotating seal for:
(1)Diameter B (free state):
Minimum serviceable limit:
11.810 inches (299.97 mm).
Maximum serviceable limit:
11.812 inches (300.02 mm).
Repair method:
Repair. Refer to TASK 72-58-45-300-802 (72-58-45, REPAIR 001).
Subtask 72-58-45-220-011
(2)Flatness of surface A (free state):
Maximum serviceable limit:
0.010 inch (0.25 mm).
Repair method:
Replace the aft rotating seal.
Subtask 72-58-45-220-012
(3)Diameter J:
Minimum serviceable limit:
9.9982 inches (253.954 mm).
Maximum serviceable limit:
10.0018 inches (254.046 mm).
Repair method:
Repair. Refer to TASK 72-58-45-300-801 (72-58-45, REPAIR 002).