* * * FOR ALL
TASK 72-00-57-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the turbine rear frame assembly (TRF). Refer to Figure 802.
•
TRF (01-020 , 72-00-04) (SIN 94000)
•
TRF (01-021 , 72-00-04) (SIN 94000) (SB 72-0160) (LPT Module Assembly - Non-Rake Capable Configuration)
•
TRF (01-022 , 72-00-04) (SIN 94000) (SB 72-0160) (LPT Module Assembly - Rake Capable Configuration).
B.Any sub-assembly or part removed for access or limited workscope must be inspected in accordance with criteria in this section. If there is no criteria, the sub-assembly or part must receive a general visual inspection (GVI) for continued serviceability. Refer to TASK 72-00-00-200-805 (72-00-00, INSPECTION 001) . If required, the component can be hand-cleaned to do a visual inspection. Refer to TASK 70-21-01-110-001 (CLEANING METHOD 1 - SOLVENT DEGREASING) or TASK 70-21-03-160-001 (CLEANING METHOD 3 - STEAM CLEANING) . GVI can not be done to components identified in TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001) that become piece part. These components must have their appropriate mandatory inspections done, unless stated differently in an applicable Service Bulletin.
C.If you find an assembly or part to be unserviceable with this procedure, refer to the applicable section of the engine manual for more disassembly and inspection procedures for the assembly or part.
D.If you will fully disassemble the TRF, this inspection is not necessary. Refer to the applicable section of the engine manual for the inspection procedure for each assembly or part.
E.The maintenance instructions in this Manual do not purport to cover all details or variations in equipment, nor do they provide for every possible contingency to be met in connection with installation, operation, maintenance, or GEAE certified repair facilities. The maintenance instructions are intended to be all-inclusive for a complete teardown and overhaul of the component or sub assembly. The individual procedures as written are one sequence based on General Electric experience. Alternate sequences to these maintenance instructions are at the discretion of the operator and/or overhaul shop provided the intent of the maintenance instructions is met. The operator and/or overhaul shop can select specific tasks to partially disassemble and assemble hardware or subassemblies based upon the on demand maintenance requirement of the individual engine work scope provided the final assembly configuration and requirements contained in the manual have been met.
F.You can observe the serviceable mount surface irregularities (machined marks around the mount bushings) on the TRF mount lugs: forward side of the forward mount lugs and aft side of the aft mount lugs. The regular production process requires specific clearance between the mounting pin and TRF mount lugs. Make sure that these TRF mount lugs are machined (if necessary) around the mount lug hole. The machining effect can be noticed as a circumferential mark, a single mark or a series of small marks located circumstantially. Usually it is only one mark located on the upper half of the mount lug surface. The machining marks are smooth, shiny and can generate a surface step within specific diameters (FM and RM) from the center of the lug bushing. Refer to Figure 801.
NOTE:
Diameters are provided only for information and are not part of inspection process.
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
 
05-21-00
Life Limits 001
 
70-21-01
Cleaning Method 1 - Solvent Degreasing
 
70-21-03
Cleaning Method 3 - Steam Cleaning
 
70-31-02
Acceptability Limits for Fluorescent-Penetrant Inspection
 
70-32-03
Spot-Fluorescent-Penetrant Inspection
 
70-42-00
Blending and Removal of High Metal Procedures
 
72-00-00
Inspection 001
D.Expendable Parts. None.
3 . Specific Inspection Procedure.
Subtask 72-00-57-230-001
CAUTION:
THE STAGES 6 AND 7 LPT BLADES ARE MADE FROM TITANIUM ALUMINIDE MATERIAL AND ARE RELATIVELY BRITTLE AT ROOM TEMPERATURE. HANDLE WITH CARE TO PREVENT DAMAGE TO THE PARTS.
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
A.Do a Class C spot-fluorescent-penetrant inspection of the outer and inner surfaces of the TRF. Refer to Figure 803 and TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION). The limits must meet Class A (non welded parts) for structures and flanges and Class B (fusion welded parts) for welds. Refer to TASK 70-31-02-220-003 (ACCEPTABILITY LIMITS FOR FLUORESCENT-PENETRANT INSPECTION) and as follows:
(1)Indications less than 0.03 inch (0.8 mm) are not interpretable and are permitted.
* * * END PRE SB   72-0160
* * * END PRE SB   72-0138
* * * END PRE SB   72-0063
Subtask 72-00-57-230-002
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
A.A.Do a Class C spot-fluorescent-penetrant inspection of the outer and inner surfaces of the TRF. Refer to Figure 804 and TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION). The limits must align with Class A (non welded parts) for structures and flanges and Class B (fusion welded parts) for welds. Refer to TASK 70-31-02-220-003 (ACCEPTABILITY LIMITS FOR FLUORESCENT-PENETRANT INSPECTION) and as follows:
(1)Indications less than 0.03 inch (0.8 mm) are not interpretable and are permitted.
* * * END SB   72-0160
* * * END SB   72-0138
* * * END SB   72-0063
4 . Visual Inspection.
Subtask 72-00-57-220-001
A.Do an inspection of the outer surface of the outer case, without area A (rear mount lugs), of the TRF for. Refer to Figure 802.
(1)Cracks in the parent material:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-053
(2)Cracks in the welds:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-012
(3)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, any length, 0.040 inch (1.02 mm) in depth after the removal of high metal, if the damage does not go fully across the mate face. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-013
(4)Dents:
Maximum serviceable limit:
Any amount, 0.060 inch (1.52 mm) in depth, if they have a smooth contour.
Maximum repairable limit:
Deleted.
Repair method:
Replace the TRF.
* * * FOR ALL
Figure 801   TRF Unusual Visual Condition on the Mount Lugs
* * * FOR ALL
Figure 802   (Sheet 1 ) TRF - Inspection
* * * FOR ALL
Figure 802   (Sheet 2 ) TRF - Inspection
* * * FOR ALL
Figure 802   (Sheet 3 ) TRF - Inspection
* * * FOR ALL
Figure 802   (Sheet 4 ) TRF - Inspection
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 1 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 2 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 3 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * PRE SB   72-0063
* * * PRE SB   72-0138
* * * PRE SB   72-0160
Figure 803   (Sheet 4 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 1 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 2 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 3 ) TRF - Inspection (Spot-FPI Areas)
* * * FOR ALL
* * * SB   72-0063
* * * SB   72-0138
* * * SB   72-0160
Figure 804   (Sheet 4 ) TRF - Inspection (Spot-FPI Areas)
Subtask 72-00-57-220-002
B.Do an inspection of the struts and airflow surfaces (hub airflow surface and outer case airflow surface), without area A (rear mount lugs) of the TRF. Refer to Figure 802 and as follows:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-014
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, 0.030 inch (0.76 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the TRF.
Subtask 72-00-57-220-015
(3)Dents on struts (struts No. 7 and No. 8 not included):
Maximum serviceable limit:
Any amount, 0.20 inch (5.1 mm) in depth with smooth contour are permitted.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-57-220-054
(4)Dents on struts No. 7 and 8:
Maximum serviceable limit:
Any amount, 0.040 inch (1.02 mm) in depth with smooth contour are permitted.
Repair method:
Replace the LPT rear frame.
Subtask 72-00-57-220-039
(5)Dents on airflow surfaces (hub airflow surface and outer case airflow surface):
Maximum serviceable limit:
Any amount, 0.060 inch (1.52 mm) in depth, if they have a smooth contour.
Maximum repairable limit:
Deleted.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-052
(6)Distortion of the hub lip (hub lip is not round or it is visually protruding to the flow path cavity):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-003
C.Do an inspection of the hub area of the TRF for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-016
(2)Nicks, dents, scores, and scratches:
Maximum serviceable limit:
Any amount, any length, 0.030 inch (0.76 mm) in depth after the removal of high metal, if the damage does not go fully across the mate face. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-004
D.Do an inspection of the rear mount lugs described by area A (airflow side and outer surface side of the outer case) for. Refer to Figure 802.
(1)Cracks in parent metal:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-055
(2)Cracks in the welds:
Maximum serviceable limit:
One crack, 0.060 inch (1.52 mm) in length for each joint, no more than two cracks for each frame.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-056
(3)Circumferential scratches/scoring of the mount bushings:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, 0.005 inch (0.13 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Blend to remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-017
(4)Axial scratches/scoring of the mount bushings:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, 0.003 inch (0.08 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . After the repair, 90 percent of the hole circumference must not be more than a 1.8025 inches (45.784 mm) in diameter.
Repair method:
Blend to remove high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-018
(5)Deleted.
Subtask 72-00-57-220-040
(6)Bushing out of position:
Maximum serviceable limit:
Any amount, if the bushing and/or bore are not damaged.
Repair method:
Repair. Refer to TASK 72-00-00-800-809 (72-00-00, SPECIAL PROCEDURE 009) .
Subtask 72-00-57-220-041
(7)Gouges, nicks, or dents located on the forward surface of the bushing shoulder of the center mount lugs.
Maximum serviceable limit:
0.003 inch (0.08 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Deleted.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-042
(8)Gouges, nicks, or dents located on the forward surface of the bushings shoulder of the outer mount lugs.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-057
(9)Nicks, dents, scores, and scratches (area M not included):
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth and 0.100 inch (2.54 mm) in length, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the TRF.
Subtask 72-00-57-220-058
(10)Nicks, dents, scores, and scratches in area M:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth, after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount 0.015 inch (0.38 mm) in depth.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-059
(11)Circumferential scratches or scores on the forward surface of the forward lugs around mount bushings:
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm) in depth, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Around mount bushings in an area 0.25 inch (6.4 mm) from bushing hole and outwards
•
Damage to fillet radius around mount lug is not accepted.
Maximum repairable limit:
•
Any amount, 0.010 inch (0.25 mm) in depth
•
Around mount bushings in an area 0.25 inch (6.4 mm) from bushing hole and outwards
•
Damage to fillet radius around mount lug is not accepted.
Repair method:
Remove the damage with a blend procedure. Remove minimum material as possible. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Do a local swab etch and spot fluorescent penetrant inspection (spot-FPI) after repair. Measure the lug thickness after blending (in blended area). Minimum lug thickness after blending needs to be 0.967 inch (24.56 mm).
Subtask 72-00-57-220-060
(12)Circumferential scratches or scores on the aft surface of the aft lugs around mount bushings:
Maximum serviceable limit:
•
Any amount, 0.005 inch (0.13 mm) in depth, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES)
•
Around mount bushings in an area 0.25 inch (6.4 mm) from bushing hole and outwards
•
Damage to fillet radius around mount lug is not accepted.
Maximum repairable limit:
•
Any amount, 0.010 inch (0.25 mm) in depth
•
Around mount bushings in an area 0.25 inch (6.4 mm) from bushing hole and outwards
•
Damage to fillet radius around mount lug is not accepted.
Repair method:
Remove the damage with a blend procedure. Remove minimum material as possible. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Do a local swab etch and spot-FPI after repair. Measure the lug thickness after blending (in blended area). Minimum lug thickness after blending needs to be 0.967 inch (24.56 mm).
Subtask 72-00-57-220-005
E.Do an inspection of the No. 5 bearing inner stationary seal (01504) and the No. 5 bearing outer stationary seal (01559) for. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the stationary seal.
Subtask 72-00-57-220-020
(2)Rubs and grooves in the nickel graphite surface:
Maximum serviceable limit:
0.015 inch (0.38 mm).
Repair method:
Replace the stationary seal.
Subtask 72-00-57-220-021
(3)Missing coating:
Maximum serviceable limit:
25 percent can be missing, if there are no axial leakage paths over 50 percent of the length.
Repair method:
Replace the stationary seal.
Subtask 72-00-57-220-006
F.Do an inspection of the cone area of the TRF for. Refer to Figure 802.
(1)Cracks in the parent material:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-022
(2)Cracks in the welds:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-023
(3)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, any length, 0.06 inch (1.5 mm) in depth after the removal of high metal, if the damage does not go fully across the mate face. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-051
(4)Dents:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-007
G.Do an inspection of the forward outer flange of the TRF for. Refer to Figure 802.
(1)Cracks (all areas):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-024
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, 0.030 inch (0.76 mm) in depth measured after the removal of high metal, if the damage does not go across more than 75 percent of the face of the flange. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, 0.060 inch (1.52 mm) in depth measured after the removal of high metal, if the damage is a minimum of 1.00 inch (25.4 mm) away from other damage and the damage does not go across more than 75 percent of the face of the flange.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-025
(3)Dents:
Maximum serviceable limit:
Any amount, if the dents do not go across more than 75 percent of the face of the flange and the flange is not distorted.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-061
(4)Wear caused by Stage 7 LPT shrouds:
Maximum serviceable limit:
Any amount, 0.016 inch (0.41 mm) in depth (from the face of the TRF forward outer flange lip), after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the TRF.
Subtask 72-00-57-220-026
(5)Distortion:
Maximum serviceable limit:
Any amount, in the free state, if the flange will seat with the mating flange at the next higher level of assembly.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-008
H.Do an inspection of the aft outer flange of the TRF for. Refer to Figure 802.
(1)Cracks (all areas):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-027
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, 0.030 inch (0.76 mm) in depth after the removal of high metal, if the damage does not go across more than 75 percent of the face of the flange. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, 0.060 inch (1.52 mm) in depth after the removal of high metal, if the damage is a minimum of 1.0 inch (25 mm) away from other damage and the damage does not go across more than 75 percent of the face of the flange.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-57-220-028
(3)Dents:
Maximum serviceable limit:
Any amount, if the dents do not go across more than 75 percent of the face of the flange and the flange is not distorted.
Repair method:
Replace TRF.
Subtask 72-00-57-220-029
(4)Distortion:
Maximum serviceable limit:
Any amount, in the free state, if the flange will seat with the mating flange at the next higher level of assembly.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-043
I.Do an inspection of the aft inner flange of the TRF for. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-044
(2)Nicks, dents, scores, and scratches (area X not included):
Maximum serviceable limit:
Any amount, 0.030 inch (0.76 mm) in depth and 0.120 inch (3.05 mm) in length after the removal of high metal, if the damage does not go across the full width of the sealing surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, 0.030 inch (0.76 mm) in depth if the damage does not go across the full width of the sealing surface.
Repair method:
Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the TRF.
Subtask 72-00-57-220-045
(3)Nicks, dents, scores, and scratches at area X:
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth and 0.120 inch (3.05 mm) in length after the removal of high metal, if the damage does not go across the full width of the sealing surface. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the TRF.
Subtask 72-00-57-220-046
(4)Deformation:
Maximum serviceable limit:
Any amount, in the free state, if the flange will seat with the mating flange at next higher level of assembly.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-047
(5)Deleted.
Subtask 72-00-57-220-009
J.Do an inspection of the connector supply assembly tube (oil supply tube) (01-160 , 72-57-00) (SIN 443A0), the connector scavenge assembly tube (oil scavenge tube) (01-330 , 72-57-00) (SIN 452A0), and the connector drain assembly tube (vent drain tube) (01-520 , 72-57-00) (SIN 458A0) for. Refer to Figure 805.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the tube.
Subtask 72-00-57-220-030
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, any length, 0.015 inch (0.38 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the tube.
Subtask 72-00-57-220-031
(3)Dents:
Maximum serviceable limit:
Any amount, 0.06 inch (1.5 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the tube.
Subtask 72-00-57-220-032
(4)Internal coking:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Remove the coking.
• For scavenge, supply tubes, and drain tubes. Refer to TASK 70-21-22-110-042 (CLEANING METHOD 22 - LIGHT DUTY AQUEOUS CLEANING (METHOD 1)) .
• For drain tubes only. Alternative cleaning methods for removing internal coke. Refer to TASK 70-22-05-110-017 (SPECIAL CLEANING PROCEDURE 5 - CLEANING INTERNAL LUBE OIL TUBES) or TASK 70-21-25-110-001 (CLEANING METHOD 25 - REMOVAL OF CARBON WITH ALKALINE GEL) .
Subtask 72-00-57-220-062
(5)External coking:
Maximum serviceable limit:
Medium coking is acceptable. Medium means after cleaning process, there is no loose coking and at least 50 percent of the tubes bare surface is visible.
Repair method:
Clean the tube again.
Subtask 72-00-57-220-048
(6)Cuts or tears in the folded edges. Refer to Figure 805.
Maximum serviceable limit:
Any amount less than 0.20 inch (5.0 mm) in length and insulation is not exposed.
Repair method:
Replace the insulation blanket.
Subtask 72-00-57-220-049
(7)Torn or missing outer material of insulation blankets:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the insulation blanket.
Subtask 72-00-57-220-050
(8)Missing retaining straps on the insulation blankets:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the insulation blanket.
Subtask 72-00-57-220-038
K.Do an inspection of the supply assembly tube (01-170 , 72-57-00) (SIN 443A1), scavenge assembly tube (01-340 , 72-57-00) (SIN 452A1), and drain tube (01-530 , 72-57-00) (SIN 458A1) as follows. Refer to Figure 805.
(1)Nicks, scratches, chafing, or scores in straight section and bends:
Maximum serviceable limit:
0.005 inch (0.13 mm) in depth.
Repair method:
Replace the tube.
Subtask 72-00-57-220-063
(2)External coking:
Maximum serviceable limit:
Medium coking is acceptable. Medium means after cleaning process, there is no loose coking and at least 50 percent of the tubes bare surface is visible.
Repair method:
Clean the tube again.
* * * FOR ALL
Figure 805   (Sheet 1 ) TRF Tubes and Brackets - Inspection
* * * FOR ALL
Figure 805   (Sheet 2 ) TRF Tubes and Brackets - Inspection
Subtask 72-00-57-220-033
(3)Deleted.
Subtask 72-00-57-220-034
(4)Deleted.
Subtask 72-00-57-220-035
(5)Deleted.
Subtask 72-00-57-220-010
L.Do an inspection of the bracket assemblies (443E0, 443E1, 452E1, 458E0) and the air eductor tube bracket assembly for. Refer to Figure 805.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the support bracket.
Subtask 72-00-57-220-011
M.Do an inspection of the eductor air tube for. Refer to Figure 805.
(1)Cracks in all areas:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the TRF.
Subtask 72-00-57-220-036
(2)Nicks, scores, and scratches:
Maximum serviceable limit:
Any amount, any length, 0.015 inch (0.38 mm) in depth after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the TRF.
Subtask 72-00-57-220-037
(3)Dents:
Maximum serviceable limit:
Any amount, 0.06 inch (1.5 mm) in depth, if the dents have a smooth contour.
Repair method:
Replace the TRF.