* * * FOR ALL
TASK 72-00-22-200-801
1 . General.
A.This procedure gives instructions to do an inspection of the fan booster assembly. Refer to Figure 801.
•
Fan Booster Assembly (20-010 , 72-00-02) (SIN 80000)
•
Fan Booster Assembly (20-011 , 72-00-02) (SIN 80000) SB 72-0156.
The fan booster assembly includes the parts that follows:
•
Stage 1 vane assembly
•
Stage 2 vane assembly
•
Stage 3 vane assembly
•
Stage 4 vane assembly
•
Booster spool
•
Booster stage 2 blades (blades)
•
Booster stage 3 blades (blades)
•
Booster stage 4 blades (blades)
•
Booster stage 5 blades (blades)
•
Stage 1 fan rotor disk (fan disk)
•
Flowpath spacer
•
Dovetail seal.
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 personnel will fully disassemble the fan booster 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.If an axisymmetric rotating part with a visible crack through the axial or radial thickness of the part feature is found during the inspection procedure, then the mating Life Limited Part(s) (LLP) can be affected. The mating LLP must be considered not serviceable and not repairable.
  NOTE:
Typical axisymmetric parts are disks, spools, blisks, seals, shafts, retainers, and other rotating structures.
  NOTE:
Contact GE Aerospace with part details of the cracked part and mating LLP with the Inquiries Widget on the https://my.geaerospace.com/ portal.
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
 
70-33-03
Special Inspection for Surface Fretting or Galling
 
70-42-00
Blending and Removal of High Metal Procedures
 
72-00-00
Inspection 001
D.Expendable Parts. None.
3 . Visual Inspection.
Subtask 72-00-22-220-001
A.Do an inspection of all areas of the stage vane assemblies that can be seen as follows. Refer to Figure 802.
(1)Broken vanes:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-040
(2)Cracks and tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
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Figure 801   (Sheet 1 ) Fan Booster Assembly - Inspection
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Figure 801   (Sheet 2 ) Fan Booster Assembly - Inspection
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Figure 802   (Sheet 1 ) Vane Assembly - Inspection
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Figure 802   (Sheet 2 ) Vane Assembly - Inspection
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Figure 802   (Sheet 3 ) Vane Assembly - Inspection
* * * FOR ALL
Figure 802   (Sheet 4 ) Vane Assembly - Inspection
Subtask 72-00-22-220-002
(3)Cracks and tears as follows. Refer to Figure 802.
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-041
(4)Fretting or galling on the flange surfaces that connect:
Maximum serviceable limit:
Any amount 0.002 inch (0.05 mm) maximum in depth.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-042
B.Do an inspection of the threaded insert inside the boss of the stage 1 vane assembly as follows. Refer to Figure 802.
(1)Missing or loose screw inserts:
Maximum serviceable limit:
Not serviceable.
Maximum repairable limit:
Any amount.
Repair method:
Replace the screw insert. Refer to TASK 70-48-00-350-015 (THREADED INSERTS) .
(2)Damaged threads on screw inserts:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the stage 1 vane assembly.
Subtask 72-00-22-220-003
C.Do an inspection of area AA on the stages 1-4 vane assemblies that can be seen as follows. Refer to Figure 802.
(1)Cracks and tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-004
(2)Nicks and dents:
Maximum serviceable limit:
Any amount, if the nick or dent is less than 0.010 inch (0.25 mm) in depth, and not less than 0.375 inch (9.53 mm) between each one. Sharp grooves are not permitted.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-005
(3)Disengaged inner shroud:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-006
D.Do an inspection of area BA on the stages 1-4 vane assemblies that can be seen as follows. Refer to Figure 802.
(1)Cracks and tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-007
(2)Nicks and dents:
Maximum serviceable limit:
Any amount, if the nicks or dents are not more than 0.010 inch (0.25 mm) in depth.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-008
(3)Distortion of the leading or trailing edge:
Maximum serviceable limit:
0.04 inch (1.0 mm) in depth on the chord, 0.4 inch (10 mm) in depth on the span.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-009
E.Do an inspection of the inner and outer shrouds of the stages 1-4 vane assemblies that can be seen as follows. Refer to Figure 802.
(1)Cracks and tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-010
(2)Galling on the rabbet diameter:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-011
F.Do an inspection of the abradable material on the stages 1, 3, and 4 vane assemblies that can be seen as follows. Refer to Figure 802.
(1)Erosion of the abradable material on the outer shroud that goes to the parent material:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-012
(2)Flaking of the abradable material on the outer shroud:
Maximum serviceable limit:
Any amount, if the total amount of flaking is not more than 9.6 sq in. (60 sq cm).
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-059
(3)Pitting, nicks, or dents in the abradable coating:
Maximum serviceable limit:
Any amount, with a total depth not more than 0.07 inch (1.7 mm), with rub marks not more than 0.04 inch (1.0 mm) in depth.
Repair method:
Replace the vane assembly.
Subtask 72-00-22-220-015
G.Do an inspection of all areas of the booster spool as follows. Refer to Figure 801.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the booster spool.
Subtask 72-00-22-220-016
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth, after removal of the high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount not more than 0.004 inch (0.10 mm) in depth.
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-00-22-220-017
H.Do an inspection of the visible areas of each of the stages 2-5 fan booster blades as follows. Refer to Figure 803.
(1)Cracks or tears:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blade.
* * * FOR ALL
Figure 803   Typical for Stages 2-5 Fan Booster Blades - Inspection
Subtask 72-00-22-220-018
I.Do an inspection in area A for each of the stages 2-5 fan booster blades that can be seen as follows. Refer to Figure 803.
(1)Nicks and/or dents on the concave or convex sides of each stage 2 and stage 4 blade chord:
Maximum serviceable limit:
Any amount 0.001 inch (0.03 mm) in depth, 0.124 inch (3.15 mm) in length.
Repair method:
Replace the blade.
Subtask 72-00-22-220-019
(2)Deleted
Subtask 72-00-22-220-020
(3)Nicks and/or dents on the leading edges:
Maximum serviceable limit:
0.0030 inch (0.076 mm) in depth.
Repair method:
Replace the blade.
Subtask 72-00-22-220-022
(4)Local distortion on the leading or trailing edges:
Maximum serviceable limit:
0.02 inch (0.5 mm) from the initial contour on the leading edge. None permitted on the trailing edge.
Repair method:
Replace the blade.
Subtask 72-00-22-220-024
(5)Scratches:
Maximum serviceable limit:
0.0030 inch (0.076 mm) in depth.
Repair method:
Replace the blade.
Subtask 72-00-22-220-025
J.Do an inspection of area B of each of the stages 2-5 fan booster blades that can be seen as follows. Refer to Figure 803.
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth, nicks, dents, and scratches 0.05 inch (1.3 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 blade.
Subtask 72-00-22-220-026
(2)Tears (high metal):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blade.
Subtask 72-00-22-220-027
(3)Local distortion on the leading and/or trailing edge:
Maximum serviceable limit:
0.02 inch (0.5 mm) from the initial contour.
Repair method:
Replace the blade.
Subtask 72-00-22-220-028
(4)Missing blade tip corner:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blade.
Subtask 72-00-22-220-044
(5)Tip curl:
Maximum serviceable limit:
Both corners of blade tip. Tip curl must not extend across more than 0.05 inch (1.3 mm) of the leading or trailing edge of the blade tip.
Repair method:
Replace the blade.
Subtask 72-00-22-220-029
K.Do an inspection of area C of each of the stages 2-5 fan booster blades that can be seen as follows. Refer to Figure 803.
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount 0.004 inch (0.10 mm) in depth, 0.118 inch (3.00 mm) in length, 0.118 inch (3.00 mm) in diameter.
Repair method:
Replace the blade.
Subtask 72-00-22-220-057
L.Do an inspection of area D of each of the stages 2-5 fan booster blades that can be seen as follows. Refer to Figure 803.
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount 0.005 inch (0.13 mm) in depth, nicks, dents, and scratches 0.05 inch (1.3 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 blade.
Subtask 72-00-22-220-058
(2)Tears (high metal):
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the blade.
Subtask 72-00-22-220-030
M.Do an inspection for each platform of the stages 2-5 fan booster blades that can be seen as follows. Refer to Figure 803.
(1)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount 0.002 inch (0.05 mm) in depth, after removal of the high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount not more than 0.006 inch (0.05 mm) in depth, after removal of high metal, on two edges of the inner rear platform where the platform touches the booster spool. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Repair method:
Blend. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
Subtask 72-00-22-220-032
N.Do an inspection of all areas of the fan disk as follows. Refer to Figure 804.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-045
(2) Discoloration that is a result of a shotpeen procedure (rust color):
Maximum serviceable limit:
Any amount.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-046
(3)Nicks, dents, and scratches (this does not include area E in the seal aft face, the retainer grooves, or area D in the webs):
Maximum serviceable limit:
• Any amount 0.004 inch (0.10 mm) in depth and 0.020 inch (0.51 mm) in width, if the damage is not in area D or E.
• Damage is not permitted in area D or E.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-047
(4)Nicks, dents, and scratches in the web areas:
Maximum serviceable limit:
• Any amount 0.004 inch (0.10 mm) in depth and 0.020 inch (0.51 mm) in width, if the damage is more than 0.50 inch (12.7 mm) away from the fan disk bore.
• No damage is permitted less than 0.50 inch (12.7 mm) away from the fan disk bore.
• The minimum distance between damage areas on a web surface must not be less than 2.00 inches (50.8 mm).
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-048
(5)Nicks, dents, scratches, and fretting (on the seal aft face only):
Maximum serviceable limit:
Any amount 0.003 inch (0.08 mm) in depth.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-049
(6)Nicks, dents, scratches, and fretting (in the retainer grooves only):
Maximum serviceable limit:
Any amount 0.003 inch (0.08 mm) in depth.
Repair method:
Replace the fan disk.
* * * FOR ALL
Figure 804   (Sheet 1 ) Fan Disk - Inspection
* * * FOR ALL
Figure 804   (Sheet 2 ) Fan Disk - Inspection
Subtask 72-00-22-220-033
O.Do an inspection of the boltholes in the spinner flange mating face, the booster spool mounting flange, and the forward fan shaft flange of the fan disk as follows. Refer to Figure 804.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-034
(2)Galling and scratches:
Maximum serviceable limit:
0.002 inch (0.05 mm) in depth, after removal of the high metal, if the galling or scratches are not on more than 50 percent of the circumference of each hole. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-035
P.Do an inspection of the dovetail slots of the fan disk as follows. Refer to Figure 804.
(1)Nicks, dents, scratches, and fretting on the dovetail pressure faces:
Maximum serviceable limit:
0.003 inch (0.08 mm) in depth, if the damage is not on more than 60 percent of the pressure face.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-050
(2)Nicks, dents, scratches, and fretting on the radius below and adjacent to the dovetail pressure faces:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-051
(3)Nicks, dents, scratches, and fretting on the bottom of the dovetail slots:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-067
(4)Wear/fretting on the bottom of the dovetail slots aft disk because of contact with the dovetail key (20-180 , 72-00-00) (SIN 8300B):
Maximum serviceable limit:
Any amount, less than 0.002 inch (0.05 mm) in depth, within area X.
Repair method:
Repair. Refer to TASK 72-00-22-300-801 (72-00-22, REPAIR 002).
Subtask 72-00-22-220-060
(5)Foreign material embedment on the bottom of the dovetail slots from the contact with the fan blade spacer wear strip:
NOTE:
At the bottom of the dovetail slot there is a manufacturing mismatch that is a typical condition. For details, refer to Figure 805.
Maximum serviceable limit:
Any amount.
Repair method:
Not applicable.
Subtask 72-00-22-220-052
(6)Nicks, dents, and scratches on the corners of the leading and trailing edges of the dovetail:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-036
Q.Do an inspection of the mounting flanges and the mating faces of the fan disk as follows. Refer to Figure 804.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-037
(2)Nicks, dents, and scratches:
Maximum serviceable limit:
Any amount, less than 0.001 inch (0.03 mm) in depth, after removal of the high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
Any amount, less than 0.005 inch (0.13 mm) in depth, after removal of the high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-038
(3)Fretting:
Maximum serviceable limit:
Any amount, if in the limits of TASK 70-33-03-220-006 (SPECIAL INSPECTION FOR SURFACE FRETTING OR GALLING) .
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-039
(4)Rub marks on the booster spool mounting flange from contact with the balance weights:
Maximum serviceable limit:
Any amount.
Repair method:
Replace the fan disk.
Subtask 72-00-22-220-053
R.Do an inspection of all areas of the flowpath spacer as follows. Refer to Figure 801.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the flowpath spacer.
Subtask 72-00-22-220-054
(2)Nicks, dents, scratches, and pits:
Maximum serviceable limit:
0.003 inch (0.08 mm) in depth, if the defects are not more than 0.5 inch (13 mm) in diameter or length after the removal of high metal. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES) .
Maximum repairable limit:
0.005 inch (0.13 mm) in depth, if the defects are not more than 0.5 inch (13 mm) in diameter or 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 fan booster assembly.
Subtask 72-00-22-220-055
S.Do an inspection of the dovetail seal as follows. Refer to Figure 801.
(1)Cracks:
Maximum serviceable limit:
Not serviceable.
Repair method:
Replace the dovetail seal.
Subtask 72-00-22-220-056
(2)Nicks and scratches:
Maximum serviceable limit:
Any amount, 0.004 inch (0.10 mm) in depth, and 0.020 inch (0.51 mm) wide.
Repair method:
Replace the dovetail seal.
Subtask 72-00-22-220-061
T.Do an inspection of area F of the flowpath spacers (01-060 , 72-22-00) (SIN 830AM). Refer to Figure 806.
(1)Erosion in the glass fiber erosion layer or carbon fiber layer:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-22-43-300-802 (72-22-43, REPAIR 002) .
Subtask 72-00-22-220-062
(2)Gouges, cuts, or scratches in the glass fiber erosion layer:
Maximum serviceable limit:
Not serviceable.
Repair method:
Repair. Refer to TASK 72-22-43-300-802 (72-22-43, REPAIR 002) .
* * * FOR ALL
Figure 805   Embedment on the Bottom of the Dovetail Slot Bottom
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Figure 806   Flowpath Spacer - Inspection Areas