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TASK 72-21-06-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the forward engine mount yoke (05-010 , 72-21-00).
B.If SB 72-0281 was applied, refer to TASK 72-00-01-200-801 (72-00-01, INSPECTION 001) .
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 72-21-06-230-001
A.Do a Class G fluorescent-penetrant inspection of the forward engine mount yoke for cracks as follows. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION) and Figure 801 or Figure 801A.
(1)Linear indications are not permitted.
NOTE:
Linear indications are indications that are four times longer than they are wide.
(2)Indications in area FA that are less than 0.015 inch (0.38 mm) in length and a minimum of 0.15 inch (3.8 mm) apart are permitted.
(3)Indications in all other areas of the forward engine mount yoke that are less than 0.03 inch (0.8 mm) in length and a minimum of 0.15 inch (3.8 mm) apart are permitted.
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Figure 801   Forward Engine Mount Yoke (Configuration 1 - 12 Bolthole Mount Bolt Configuration) - Inspection
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Figure 801A   Forward Engine Mount Yoke (Configuration 2 - 16 Bolthole Mount Bolt Configuration) - Inspection
4 . Visual Inspection.
Subtask 72-21-06-220-001
A.Do an inspection of the forward engine mount yoke as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the part.
Subtask 72-21-06-220-002
(2)Nicks or scratches in clevis hole bores and edges:
Maximum serviceable limit:
Any amount, 0.001 inch (0.03 mm) in depth. Scratches must not touch each other.
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth.
Repair method:
Do not blend. Remove high metal, if present. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-018
(3)Nicks or scratches in bolthole (configuration 1 - 12 bolthole mount bolt configuration). Refer to Figure 801.
Maximum serviceable limit:
Any amount, 0.001 inch (0.03 mm) in depth. Scratches must not touch each other.
Maximum repairable limit:
Any amount, if the ID is not more than 0.502 inch (12.75 mm) for bolthole.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-016
(4)Nicks or scratches in bolthole (configuration 2 - 16 bolthole mount bolt configuration). Refer to Figure 801A.
Maximum serviceable limit:
Any amount, 0.001 inch (0.03 mm) in depth. Scratches must not touch each other.
Maximum repairable limit:
Any amount, if the ID is not more than 0.627 inch (15.93 mm) for bolthole AB and 0.502 inch (12.75 mm) for bolthole AA.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-003
(5)Nicks in all other areas (configuration 1 - 12 bolthole mount bolt configuration). Refer to Figure 801.
Maximum serviceable limit:
Any amount, 0.015 inch (0.38 mm) in depth and 0.25 inch (6.4 mm) in length. Sharp edges are not permitted. Nicks must have a distance of 0.35 inch (8.9 mm) between them.
Maximum repairable limit:
Any amount, 0.05 inch (1.3 mm) in depth and 1.00 inch (25.4 mm) in length.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-017
(6)Nicks in all other areas (configuration 2 - 16 bolthole mount bolt configuration). Refer to Figure 801A.
Maximum serviceable limit:
Any amount, 0.015 inch (0.38 mm) in depth and 0.25 inch (6.4 mm) in length. Sharp edges are not permitted. Nicks must have a distance of 0.35 inch (8.9 mm) between them.
Maximum repairable limit:
Any amount, 0.03 inch (0.8 mm) in depth and 1.00 inch (25.4 mm) in length.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-004
(7)Scratches in all other areas:
Maximum serviceable limit:
Any amount, 0.005 inch (0.13 mm) in depth. Scratches must not touch each other.
Maximum repairable limit:
Any amount, 0.015 inch (0.38 mm) in depth.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-005
(8)High metal on mating surfaces:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-21-06-220-006
(9)Wear in the bushing boltholes:
Maximum serviceable limit:
Any amount, if the ID is not more than 1.1260 inch (28.600 mm).
Repair method:
Replace the bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-020
(10)Alternative Procedure Available. Bushing migration. Refer to Figure 802:
NOTE:
This procedure is applicable only, if the same bushing is never pushed back before.
Maximum serviceable limit:
Any amount, if the dimensions CLZ, CLW, CMZ, CRZ, and CRW are serviceable. Refer to Subtask 72-21-06-220-022 (paragraph 4.A.(11)), Subtask 72-21-06-220-024 (paragraph 4.A.(12)), Subtask 72-21-06-220-026 (paragraph 4.A.(13)), Subtask 72-21-06-220-028 (paragraph 4.A.(14)), and Subtask 72-21-06-220-030 (paragraph 4.A.(15)).
Repair method:
•
If the bushings are migrated and in the maximum serviceable limit above. Condition can be accepted to fly as it is for 5000 cycles. It must be replaced in less than 5000 cycles
•
If the bushings are migrated and outside the serviceable limit above. Bushing has to be re-positioned back. Refer to TASK 72-00-01-800-802 (72-00-01, SPECIAL PROCEDURE 002).
NOTE:
Re-positioned bushings must be replaced in less than 5000 flight cycles.
Subtask 72-21-06-220-021
(10).A.Alternative Procedure. Bushing migration. Refer to Figure 802:
NOTE:
If the bushing is pushed back before, re-positioned bushings must be replaced in less than 5000 flight cycles.
Maximum serviceable limit:
Any amount, if the dimensions CLZ, CLW, CMZ, CRZ, and CRW are serviceable. Refer to Subtask 72-21-06-220-022 (paragraph 4.A.(11)), Subtask 72-21-06-220-024 (paragraph 4.A.(12)), Subtask 72-21-06-220-026 (paragraph 4.A.(13)), Subtask 72-21-06-220-028 (paragraph 4.A.(14)), and Subtask 72-21-06-220-030 (paragraph 4.A.(15)).
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-022
(11)Alternative Procedure Available. Dimension CLZ:
NOTE:
This procedure is applicable only, if the same bushing is never pushed back before.
Maximum serviceable limit:
2.955 inches (75.06 mm), if the bushings are not migrated.
Repair method:
•
If the bushings are migrated and in the maximum serviceable limit above. Condition can be accepted to fly as it is for 5000 cycles. It must be replaced in less than 5000 cycles
•
If the bushings are migrated and outside the serviceable limit above. Bushing has to be re-positioned back. Refer to TASK 72-00-01-800-802 (72-00-01, SPECIAL PROCEDURE 002).
NOTE:
Re-positioned bushings must be replaced in less than 5000 flight cycles.
Subtask 72-21-06-220-023
(11).A.Alternative Procedure. Dimension CLZ:
NOTE:
If the bushing is pushed back before, re-positioned bushings must be replaced in less than 5000 flight cycles.
Maximum serviceable limit:
2.955 inches (75.06 mm), if the bushings are not migrated.
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-024
(12)Alternative Procedure Available. Dimension CLW:
NOTE:
This procedure is applicable only, if the same bushing is never pushed back before.
Minimum serviceable limit:
1.135 inches (28.83 mm), if the bushings are not migrated.
Repair method:
•
If the bushings are migrated and in the serviceable limit above. Condition can be accepted to fly as it is for 5000 cycles. It must be replaced in less than 5000 cycles
•
If the bushings are migrated and outside the serviceable limit above. Bushing has to be re-positioned back. Refer to TASK 72-00-01-800-802 (72-00-01, SPECIAL PROCEDURE 002).
NOTE:
Re-positioned bushings must be replaced in less than 5000 flight cycles.
Subtask 72-21-06-220-025
(12).A.Alternative Procedure. Dimension CLW:
NOTE:
If the bushing is pushed back before, re-positioned bushings must be replaced in less than 5000 flight cycles.
Minimum serviceable limit:
1.135 inches (28.83 mm), if the bushings are not migrated.
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-026
(13)Alternative Procedure Available. Dimension CMZ:
NOTE:
This procedure is applicable only, if the same bushing is never pushed back before.
Maximum serviceable limit:
2.955 inches (75.06 mm), if the bushings are not migrated.
Repair method:
•
If the bushings are migrated and in the maximum serviceable limit above. Condition can be accepted to fly as it is for 5000 cycles. It must be replaced in less than 5000 cycles
•
If the bushings are migrated and outside the serviceable limit above. Bushing has to be re-positioned back. Refer to TASK 72-00-01-800-802 (72-00-01, SPECIAL PROCEDURE 002).
NOTE:
Re-positioned bushings must be replaced in less than 5000 flight cycles.
Subtask 72-21-06-220-027
(13).A.Alternative Procedure. Dimension CMZ:
NOTE:
If the bushing is pushed back before, re-positioned bushings must be replaced in less than 5000 flight cycles.
Maximum serviceable limit:
2.955 inches (75.06 mm), if the bushings are not migrated.
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-028
(14)Alternative Procedure Available. Dimension CRZ:
NOTE:
This procedure is applicable only, if the same bushing is never pushed back before.
Maximum serviceable limit:
2.955 inches (75.06 mm), if the bushings are not migrated.
Repair method:
•
If the bushings are migrated and in the maximum serviceable limit above. Condition can be accepted to fly as it is for 5000 cycles. It must be replaced in less than 5000 cycles
•
If the bushings are migrated and outside the serviceable limit above. Bushing has to be re-positioned back. Refer to TASK 72-00-01-800-802 (72-00-01, SPECIAL PROCEDURE 002).
NOTE:
Re-positioned bushings must be replaced in less than 5000 flight cycles.
Subtask 72-21-06-220-029
(14).A.Alternative Procedure. Dimension CRZ:
NOTE:
If the bushing is pushed back before, re-positioned bushings must be replaced in less than 5000 flight cycles.
Maximum serviceable limit:
2.955 inches (75.06 mm), if the bushings are not migrated.
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-030
(15)Alternative Procedure Available. Dimension CRW:
NOTE:
This procedure is applicable only, if the same bushing is never pushed back before.
Minimum serviceable limit:
1.135 inches (28.83 mm), if the bushings are not migrated.
Repair method:
•
If the bushings are migrated and in the serviceable limit above. Condition can be accepted to fly as it is for 5000 cycles. It must be replaced in less than 5000 cycles
•
If the bushings are migrated and outside the serviceable limit above. Bushing has to be re-positioned back. Refer to TASK 72-00-01-800-802 (72-00-01, SPECIAL PROCEDURE 002).
NOTE:
Re-positioned bushings must be replaced in less than 5000 flight cycles.
Subtask 72-21-06-220-031
(15).A.Alternative Procedure. Dimension CRW:
NOTE:
If the bushing is pushed back before, re-positioned bushings must be replaced in less than 5000 flight cycles.
Minimum serviceable limit:
1.135 inches (28.83 mm), if the bushings are not migrated.
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
Subtask 72-21-06-220-032
B.Do an inspection of the bushing. Refer to Figure 802.
(1)Wear or fretting:
Maximum serviceable limit:
Any amount, while dimensions CRZ and CLZ are greater than 2.925 inches (74.29 mm) and dimensions CRW and CLW are less than 1.165 inches (29.59 mm). Remove any high metal or sharp edges. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Remove and install the new bushing. Refer to TASK 72-00-01-800-803 (72-00-01, SPECIAL PROCEDURE 003) .
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Figure 802   (Sheet 1 ) Forward Engine Mount Yoke - Dimensional Inspection
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Figure 802   (Sheet 2 ) Forward Engine Mount Yoke - Dimensional Inspection
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Figure 802   (Sheet 3 ) Forward Engine Mount Yoke - Dimensional Inspection
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Figure 802   (Sheet 4 ) Forward Engine Mount Yoke - Dimensional Inspection