* * * FOR ALL
TASK 72-00-30-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the high pressure compressor (HPC) assembly:
•
(33-009 , 72-00-02) (SIN 00108)
•
(33-010 , 72-00-02) (SIN 00108)
•
(33-011 , 72-00-02) (SIN 00108)
•
(33-012 , 72-00-02) (SIN 00108) (SB 72-0158).
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.
(1)If you replace the stage 9 vane sector or honeycomb seal, refer to TASK 72-30-00-800-802 (72-30-00, SPECIAL PROCEDURE 002).
NOTE:
This procedure is to prevent the spool seal teeth penetration in the honeycomb material and to prevent an overheat of the seal teeth material.
(2)If you replace the stage 9 vane sector or honeycomb seal and TASK 72-30-00-800-802 (72-30-00, SPECIAL PROCEDURE 002) is not done, then the overhaul of the HPC stage 6-10 spool must take place.
NOTE:
This procedure is necessary to protect the spool seal teeth during rubbing against the new honeycomb without grooves.
(a)For the replacement of the seal tooth coating, refer to TASK 72-31-45-300-802 (72-31-45, REPAIR 002).
C.If you do this procedure and find that an assembly or part is unserviceable, refer to the applicable section of the engine manual for more disassembly and inspection procedures for the assembly or part.
D.If you or other personnel will fully disassemble the HPC assembly, this inspection is not necessary. Refer to the applicable section of the engine manual for the inspection procedure for each 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.There are two configurations of the variable stator vane (VSV) actuating rings:
•
Configuration 1 actuating rings have a thin extension arm on each end of the ring (area A).
•
Configuration 2 actuating rings do not have the thin extension arm on the end of each ring. The thin extension arm was removed to improve assembly access. Refer to Figure 802.
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
 
70-32-02
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 72-00-30-250-001
A.Do an eddy current inspection of the coated seal teeth on the CDP rotating seal (CDP seal) (01-460 , 72-31-00) (SIN 050NC) or (02-460 , 72-31-00) (SIN 050NC). Refer to TASK 72-00-31-800-801 (72-00-31, SPECIAL PROCEDURES 001).
NOTE:
This inspection is required only during performance restoration shop visits (PRSV). This inspection is not required for a quick turn or low maintenance shop visits.
Subtask 72-00-30-230-001
B.Do a fluorescent penetrant inspection of any visual indication to confirm cracks. Refer to TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION).
4 . Visual Inspection.
CAUTION:
DO NOT PROCESS TITANIUM PARTS IN COMPOUNDS THAT CONTAIN HALOGEN. DO NOT APPLY INSPECTION MATERIALS TO TITANIUM WITH AEROSOL-TYPE DISPENSERS THAT HAVE HALOGEN COMPOUNDS AS PROPELLANTS. CRACKING CAN OCCUR.
Subtask 72-00-30-220-001
A.Do an inspection of the HPC stator forward case assembly (case assembly) (073A0) as follows. Refer to Figure 801.
(1)Cracks in the outer surface (skin):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the case assembly.
* * * FOR ALL
Figure 801   HPC Assembly - Inspection
Subtask 72-00-30-220-002
(2)Cracks in the ribs:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount. The depth of all blends must not go below the skin of the case.
Repair method:
Remove all cracks with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-30-220-003
(3)Cracks in the horizontal and circumferential flanges:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the case assembly.
Subtask 72-00-30-220-004
(4)Nuts and bolts that are loose, broken, or missing:
Maximum serviceable limit:
Not serviceable.
Maximum serviceable limit:
Any amount.
Repair method:
Replace the nut or bolt.
Subtask 72-00-30-220-005
(5)Discoloration (hot spots) on all surfaces:
Maximum serviceable limit:
Any amount, if the metal is not crazed, and there are no related cracks.
Repair method:
Replace the case assembly.
Subtask 72-00-30-220-006
B.Do an inspection of the HPC stator extension case (extension case) (080AL) as follows. Refer to Figure 801.
(1)Nicks, pits, scores, and scratches on all surfaces:
Maximum serviceable limit:
Any amount, all lengths, 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, all lengths, 0.020 inch (0.51 mm) in depth, if the radius at the bottom of the blend is at least 0.050 inch (1.27 mm).
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 72-00-30-220-047
(2)Damaged threads on the mounting pads:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the self-locking insert. Refer to TASK 72-30-01-300-801 (72-30-01, REPAIR 001).
Subtask 72-00-30-220-011
CAUTION:
IF LEVER ARM DISTRESS OR INCORRECT ASSEMBLY RESULTS IN A VANE SCHEDULING ERROR, YOU MUST DO A SPECIAL INSPECTION OF THE COMPRESSOR ROTOR BLADES.
C.Do an inspection of all areas of each of the VSV stages 1-4 lever arms (lever arms) (071D1, 071D2, 071D3, 071D4, 071D6, 071D7, 071D8, 071D9) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the lever arm.
* * * FOR ALL
Figure 802   (Sheet 1 ) VSV Stages 1-4 Hardware
* * * FOR ALL
* * * PRE SB   72-0052( Thin Arm Actuating Rings )
Figure 802   (Sheet 2 ) VSV Stages 1-4 Hardware - Configuration 1
* * * FOR ALL
* * * SB   72-0052( Improved Assembly Access )
Figure 802   (Sheet 3 ) VSV Stages 1-4 Hardware - Configuration 2
* * * FOR ALL
Figure 802   (Sheet 4 ) VSV Stages 1-4 Hardware
Subtask 72-00-30-220-012
(2)Distortion:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the lever arm.
Subtask 72-00-30-220-013
(3)Nicks, dents, and scratches in area H:
Maximum serviceable limit:
0.001 inch (0.03 mm) in depth, if damage can be fully removed with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the lever arm.
Subtask 72-00-30-220-014
(4)Nicks, dents, and scratches in area G:
Maximum serviceable limit:
Any amount, 0.006 inch (0.15 mm) in depth, after the removal of high metal, if the bottom of the damage does not have a sharp point. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, if you can fully remove the damage with a blend that is to a depth of not more than 0.010 inch (0.25 mm).
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 72-00-30-220-015
D.Do an inspection of the pin of each lever arm as follows. Refer to Figure 802.
(1)Distortion:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the lever arm.
Subtask 72-00-30-220-016
(2)Looseness of the heads:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the lever arm.
Subtask 72-00-30-220-017
(3)Breaks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the lever arm.
Subtask 72-00-30-220-018
CAUTION:
IF LEVER ARM DISTRESS OR INCORRECT ASSEMBLY RESULTS IN A VANE SCHEDULING ERROR, YOU MUST DO A SPECIAL INSPECTION OF THE COMPRESSOR ROTOR BLADES.
E.Do an inspection of all areas of each of the upper and lower HPC stator stages 1-4 VSV actuating rings (actuating rings) (071A1, 071A2, 071A3, 071A4, 071A6, 071A9) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the actuating ring.
Subtask 72-00-30-220-019
(2)Distortion (twists or bends):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the actuating ring.
Subtask 72-00-30-220-020
(3)Scratches:
Maximum serviceable limit:
•
Four in each segment, 0.015 inch (0.38 mm) in depth
•
Any amount, 0.005 inch (0.13 mm) in depth.
Maximum repairable limit:
Any amount, if you can fully remove the scratches with a blend that is to a depth of not more than 0.017 inch (0.43 mm). Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Remove the scratches with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-30-220-021
(4)Nicks and dents (does not include area A):
Maximum serviceable limit:
Any amount, 0.015 inch (0.38 mm) in depth.
Maximum repairable limit:
Any amount, if you can fully remove the nick or dent with a blend that is to a depth of not more than 0.017 inch (0.43 mm). Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Remove the scratches with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-30-220-040
* * * PRE SB   72-0052( Introduction of New VSV Lever Arm System )
(5)Nicks or dents in area A:
Maximum serviceable limit:
Any amount, 0.060 inch (1.52 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 actuating ring.
NOTE:
SB 72-0052 does not require inspection of all areas of each of the upper and lower HPC stator stages 1-4 VSV actuating rings nicks or dents in area A.
* * * END PRE SB   72-0052
Subtask 72-00-30-220-022
F.Do an inspection of each of the lever pin bushings (bushings) of the actuating rings as follows. Refer to Figure 802.
(1)Bushings that are broken or worn:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the bushing.
Subtask 72-00-30-220-023
G.Do an inspection of each of the VSV stages 1-4 actuating ring bridges (bridges) (071E1, 071E2, 071E3, 071E4, 071E6, 071E9) on the actuating rings as follows. Refer to Figure 802.
(1)Cracks or breaks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the bridge.
Subtask 72-00-30-220-036
(2)Nicks, dents, and scratches:
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, 0.010 inch (0.25 mm) in depth.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) . Do an inspection. Refer to TASK 70-32-03-230-002 (SPOT-FLUORESCENT-PENETRANT INSPECTION) .
Subtask 72-00-30-220-024
CAUTION:
IF LEVER ARM DISTRESS OR INCORRECT ASSEMBLY RESULTS IN A VANE SCHEDULING ERROR, YOU MUST DO A SPECIAL INSPECTION OF THE COMPRESSOR ROTOR BLADES.
H.Do an inspection of each torque shaft (07500-2, 07501-2) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the torque shaft.
Subtask 72-00-30-220-025
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, 0.006 inch (0.15 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, if you can fully remove the damage with a blend that is to a depth of not more than 0.015 inch (0.38 mm).
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 72-00-30-220-026
CAUTION:
IF LEVER ARM DISTRESS OR INCORRECT ASSEMBLY RESULTS IN A VANE SCHEDULING ERROR, YOU MUST DO A SPECIAL INSPECTION OF THE COMPRESSOR ROTOR BLADES.
I.Do an inspection of each of the turnbuckles (07500-24, 07501-24) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the turnbuckle.
Subtask 72-00-30-220-027
(2)Nicks, dents, scores, scratches, and pits:
Maximum serviceable limit:
Any amount, 0.006 inch (0.15 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, if you can fully remove the damage with a blend that is to a depth of not more than 0.008 inch (0.20 mm).
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 72-00-30-220-028
(3)Looseness of the ball of each spherical bearing:
Maximum serviceable limit:
Any amount, if there is not more than 0.006 inch (0.15 mm) of radial movement.
Repair method:
Replace the spherical bearing.
Subtask 72-00-30-220-029
CAUTION:
IF LEVER ARM DISTRESS OR INCORRECT ASSEMBLY RESULTS IN A VANE SCHEDULING ERROR, YOU MUST DO A SPECIAL INSPECTION OF THE COMPRESSOR ROTOR BLADES.
J.Do an inspection of the forward supports (07500-3, 07501-3) and aft supports (07500-4, 07501-4) that attach the torque shafts (07500-2, 07501-2) to the case assembly (073A0) as follows. Refer to Figure 802.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the forward or aft support.
Subtask 72-00-30-220-030
(2)Nicks, dents, scores, scratches, and pits:
Maximum serviceable limit:
Any amount, 0.006 inch (0.15 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, if you can fully remove the damage with a blend that is to a depth of not more than 0.015 inch (0.38 mm).
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 72-00-30-220-031
(3)Looseness of the ball of each spherical bearing:
Maximum serviceable limit:
Any amount, if there is not more than 0.006 inch (0.15 mm) of radial movement.
Repair method:
Replace the spherical bearing.
Subtask 72-00-30-220-037
K.Do an inspection of the AGB mounts for:
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the case assembly.
Subtask 72-00-30-220-038
(2)Nicks, dents, and scratches (does not include spherical bearing):
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the case assembly.
Subtask 72-00-30-220-039
(3)Wear, fretting, and galling on the AGB support mount lugs:
Maximum serviceable limit:
Any amount, up to 0.010 inch (0.25 mm) in depth, after removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the case assembly.
Subtask 72-00-30-220-041
L.Do an inspection in the AGB mount spherical bearings of the HPC forward lower case assembly as follows. Refer to Figure 803.
(1)Circumferential movement of the ball:
Maximum serviceable limit:
Ball shall rotate freely under finger pressure.
Repair method:
Replace the spherical bearing. Refer to TASK 72-32-01-300-807 (72-32-01, REPAIR 007).
Subtask 72-00-30-220-042
(2)Axial looseness of the outer race in the AGB mount:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the spherical bearing. Refer to TASK 72-32-01-300-807 (72-32-01, REPAIR 007).
Subtask 72-00-30-220-043
(3)Nicks, dents, and scratches of the spherical surfaces and the ID of the ball:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the spherical bearing. Refer to TASK 72-32-01-300-807 (72-32-01, REPAIR 007).
Subtask 72-00-30-220-044
(4)Galling, fretting or wear on the spherical surfaces, the ID (diameters BA and BB), and the lateral faces of the ball. Refer to Figure 803.
Maximum serviceable limit:
Any amount, if in limits of TASK 70-33-03-220-006 (SPECIAL INSPECTION FOR SURFACE FRETTING OR GALLING) .
Repair method:
Replace the spherical bearing. Refer to TASK 72-32-01-300-807 (72-32-01, REPAIR 007).
Subtask 72-00-30-220-045
(5)Radial movement of the ball:
Maximum serviceable limit:
Any amount, if less than 0.0016 inch (0.041 mm).
Repair method:
Replace the spherical bearing. Refer to TASK 72-32-01-300-807 (72-32-01, REPAIR 007).
Subtask 72-00-30-220-046
(6)Axial movement of the ball:
Maximum serviceable limit:
0.003 inch (0.08 mm).
Repair method:
Replace the spherical bearing. Refer to TASK 72-32-01-300-807 (72-32-01, REPAIR 007).
* * * FOR ALL
Figure 803   AGB Mounts and Spherical Bearings - Inspection
Subtask 72-00-30-220-032
M.Do an inspection of the HPC rotor stage 6-10 spool (spool) (050AR) and CDP rotating seal (CDP seal) (050NC) as follows. Refer to Figure 804 and Figure 805.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the CDP rotating seal or spool.
Subtask 72-00-30-220-033
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the CDP rotating seal or spool.
* * * FOR ALL
Figure 804   Spool - Inspection
* * * FOR ALL
Figure 805   CDP Seal - Inspection
Subtask 72-00-30-220-048
N.Do an inspection of stage 10 blades. Refer to Figure 806 and do as follows:
(1)Nicks, dents, and scratches on the leading and trailing edges of the airfoil in area A (does not include root fillet radius):
Maximum serviceable limit:
Any amount, 0.010 inch (0.25 mm) in depth.
Repair method:
Replace the blade.
Subtask 72-00-30-220-049
(2)Nicks, pits, dents, and scratches on the leading and trailing edges of the airfoil in area B:
Maximum serviceable limit:
Any amount, 0.020 inch (0.51 mm) in depth.
Maximum repairable limit:
Any amount, 0.025 inch (0.64 mm) in depth.
Repair method:
Repair. Remove the damage with a blend procedure. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Subtask 72-00-30-220-050
(3)Nicks and pits in the fillet area:
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth, 0.020 inch (0.51 mm) in length or in diameter.
Repair method:
Replace the blade.
Subtask 72-00-30-220-051
(4)Dents in fillet except leading edge of fillet:
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth and 0.020 inch (0.51 mm) in length or in diameter.
Repair method:
Replace the blade.
Subtask 72-00-30-220-052
(5)Dents in leading edge of fillet:
Maximum serviceable limit:
One dent 0.005 inch (0.13 mm) maximum with a length to depth ratio of seven to one.
Repair method:
Replace the blade.
Subtask 72-00-30-220-053
(6)Scratches in the fillet area (does not include transverse scratches):
Maximum serviceable limit:
Any amount, 0.003 inch (0.08 mm) in depth, 0.10 inch (2.5 mm) in length.
Repair method:
Replace the blade.
Subtask 72-00-30-220-054
(7)Tears and cracks on the leading and trailing edges in area A including fillet area:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blade.
Subtask 72-00-30-220-057
(8)Tears and cracks on the leading and trailing edges in area B:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount, 0.025 inch (0.64 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 72-00-30-220-055
(9)Do an inspection of the blade platform flowpath surface and aft edges for nicks, dents, pits, and scratches:
Maximum serviceable limit:
• Any amount, 0.005 inch (0.12 mm) in depth, any length on platform flowpath surface
• Any amount, 0.005 inch (0.12 mm) in depth, any length on platform edges.
Repair method:
Replace the blade.
Subtask 72-00-30-220-056
(10)Missing coating on all surfaces:
Maximum serviceable limit:
Any amount.
* * * FOR ALL
Figure 806   Stage 10 Blade Inspection