W DOC AIRBUS | AMM A320F

Replacement of the Diffuser Outer Case Borescope Plug Lock Ring [PW11]

TASK 72-41-01-920-804-A
Replacement of the Diffuser Outer Case Borescope Plug Lock Ring

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION: THIS AIRCRAFT MAINTENANCE MANUAL REPAIR LETS YOU REPLACE ONLY THE ORIGINAL EQUIPMENT MANUFACTURER'S NUT PLATES. IF THERE IS DAMAGE TO THE HOLE(S) AND AN OVERSIZE NUT PLATE IS NECESSARY, THEN YOU MUST NOT DO THE REPAIR ON-WING. YOU MUST REMOVE AND REPAIR THE PART (REFER TO THE APPLICABLE CLEANING, INSPECTION & REPAIR MANUAL).
CAUTION: MAKE SURE THAT DURING THE REPAIR, PARTS AND DEBRIS DO NOT GO INTO THE ENGINE. IF THEY DO, DAMAGE TO THE ENGINE WILL OCCUR.
ZONE: 400
1. Reason for the Job
Use this procedure to remove the loose or damaged diffuser outer case borescope plug lock ring.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
1
BOLT - WORK (0.250 - 28 IN.)
No specific
3
COVER - PROTECTION
No specific
1
WASHER DIA 0,250 IN (6,35 MM)
No specific
1
WRENCH - STANDARD
PWA115141
1
PUSHER, INSTALLATION
PWA115422
1
PUSHER, INSTALLATION - HPC
PWA212004
1
BORESCOPE LOCK PUSHER
PWA212014
1
PUSHER, INSTALLATION
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.P03-001)
lubricant, aircraft turbine engine
(Material No.P03-007)
PMC 9534 gage lubricant oil
(Material No.P03-015)
PMC 9545 penetrating fluid (oil type)
(Material No.P03-016)
PMC 9503 penetrating fluid (oil type)
(Material No.P03-017)
penetrating oil (SPMC 188)
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 70-24-00-910-801-A
SPOP 427 - Application of Penetrating Oils for Disassembly
TASK 70-27-00-910-804-A
SPOP 208 - Degreasing of Parts by Solvent Wiping
TASK 71-00-00-860-833-A
Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A
Closing of the Fan Cowl Doors
TASK 72-00-00-400-804-A
Installation of the Borescope Plugs
TASK 78-30-00-040-805-A
Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A
Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A
Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A
Closing of the Thrust Reverser Cowl-Doors
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (PRE SB C-72-00-0043A)
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0043A)
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0098A)
3. Job Set-up
Subtask 72-41-01-941-052-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
Subtask 72-41-01-010-054-A ** ON A/C NOT FOR ALL
B. Get Access
   (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
   (2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 72-41-01-040-052-A ** ON A/C NOT FOR ALL
C. Deactivation of the Thrust Reverser for Maintenance
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
   (1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).
Subtask 72-41-01-010-055-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
4. Procedure
CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 72-41-01-920-052-A ** ON A/C NOT FOR ALL
A. Removal and Replacement of the Diffuser Outer Case Borescope Plug Lock Ring

PRE SB C-72-00-0043A (Config-1 Initial Design Configuration)

F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (PRE SB C-72-00-0043A) ** ON A/C NOT FOR ALL
   (1) Removal of the protection covers:
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
     (a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
   (2) Remove all external attachments that are necessary to help in the removal and installation of the borescope plug lock(s).
   (3) Remove the loose or damaged borescope AP HPC-7, AP HPC-8 or AP DIFF-1 plug lock ring from the diffuser outer case as follows:
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (PRE SB C-72-00-0043A) ** ON A/C NOT FOR ALL
CAUTION: WHEN YOU REMOVE THE BORESCOPE PLUG LOCK, BE CAREFUL NOT TO CAUSE DAMAGE TO THE DIFFUSER CASE BOSS PARENT MATERIAL.
     (a) Remove the loose or damaged borescope plug lock with the small pry bar.
NOTE: The diffuser case boss parent material must not be damaged.
     (b) Apply penetrating oil to the necessary areas by SPOP 427 before you remove the lock ring, if necessary (Ref. AMM TASK 70-24-00-910-801).
NOTE: These penetrating oils are specially for aluminum, magnesium, titanium, steel, nickel, single crystal and cobalt alloy parts.
       1 P03-016PMC 9503 penetrating fluid (oil type).
       2 PMC 9534 gage lubricant oil (Material No.P03-007) .
       3 P03-015PMC 9545 penetrating fluid (oil type).
       4 P03-017penetrating oil (SPMC 188).
   (4) Clean the repair area by SPOP 208 (Ref. AMM TASK 70-27-00-910-804).
   (5) Do the visual and dimensional inspections of the borescope plug lock counterbore and boss face as follows:
     (a) The counterbore and boss face must have no nicks, burrs, scratches, tool marks, corrosion, wear or damage.
     (b) Counterbore diameter for the borescope AP HPC-7 plug lock ring must be between 0.475 in. (12.065 mm) and 0.477 in. (12.116 mm) before the installation
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (PRE SB C-72-00-0043A) ** ON A/C NOT FOR ALL
     (c) Counterbore diameter for the borescope AP HPC-8 and AP DIFF-1 plug lock ring must be between 0.757 in. (19.228 mm) and 0.759 in. (19.279 mm) before the installation
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (PRE SB C-72-00-0043A) ** ON A/C NOT FOR ALL
   (6) Install the new borescope AP HPC-8 plug lock ring with the PWA115141 PUSHER, INSTALLATION to the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss locking insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP HPC-8 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115141 PUSHER, INSTALLATION.
     (b) Insert the PWA115141 PUSHER, INSTALLATION with the borescope plug lock into the counterbore.
     (c) Tighten the PWA115141 PUSHER, INSTALLATION with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (d) Remove the PWA115141 PUSHER, INSTALLATION.
     (e) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (7) Install the new borescope AP HPC-7 plug lock ring with the PWA115422 PUSHER, INSTALLATION - HPC to the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss locking insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP HPC-7 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115422 PUSHER, INSTALLATION - HPC.
     (b) Install the borescope AP HPC-7 plug lock ring to the PWA115422 PUSHER, INSTALLATION - HPC.
     (c) Insert the PWA115422 PUSHER, INSTALLATION - HPC with the borescope plug lock into the counterbore.
     (d) Tighten the PWA115422 PUSHER, INSTALLATION - HPC with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (e) Remove the PWA115422 PUSHER, INSTALLATION - HPC.
     (f) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (8) Install the new borescope AP DIFF-1 plug lock ring with the PWA115141 PUSHER, INSTALLATION to the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP DIFF-1 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115141 PUSHER, INSTALLATION.
     (b) Install the borescope AP DIFF-1 plug lock ring to the PWA115141 PUSHER, INSTALLATION.
     (c) Insert the PWA115141 PUSHER, INSTALLATION with the borescope plug lock into the counterbore.
     (d) Tighten the PWA115141 PUSHER, INSTALLATION with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (e) Remove the PWA115141 PUSHER, INSTALLATION.
     (f) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (9) Install all of the borescope plugs that were removed (Ref. AMM TASK 72-00-00-400-804).
   (10) Examine the assembly for foreign objects, damage and correct assembly.
   (11) Installation of the protection covers:
CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.
     (a) Make sure that you install the COVER - PROTECTION as necessary to to prevent damage to the engine.

END OF PRE SB C-72-00-0043A (Config-1 Initial Design Configuration)

Subtask 72-41-01-920-053-A ** ON A/C NOT FOR ALL
B. Removal and Replacement of the Diffuser Outer Case Borescope Plug Lock Ring

POST SB C-72-00-0043A (Config-2 Case Assembly Durability Improvement Configuration)

F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0043A) ** ON A/C NOT FOR ALL
   (1) Removal of the protection covers:
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
     (a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
   (2) Remove all the external attachments that are necessary to help in the removal and installation of the borescope plug lock(s).
   (3) Remove the loose or damaged borescope AP HPC-7, AP HPC-8, AP DIFF-1 or AP DIFF-2 plug lock ring from the diffuser outer case as follows:
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0043A) ** ON A/C NOT FOR ALL
CAUTION: WHEN YOU REMOVE THE BORESCOPE PLUG LOCK, BE CAREFUL NOT TO CAUSE DAMAGE TO THE DIFFUSER CASE BOSS PARENT MATERIAL.
     (a) Remove the loose or damaged borescope plug lock with the small pry bar.
     (b) Apply penetrating oil to the necessary areas by SPOP 427 before you remove the lock ring, if necessary (Ref. AMM TASK 70-24-00-910-801).
NOTE: These penetrating oils are specially for aluminum, magnesium, titanium, steel, nickel, single crystal and cobalt alloy parts.
       1 P03-016PMC 9503 penetrating fluid (oil type).
       2 PMC 9534 gage lubricant oil (Material No.P03-007) .
       3 P03-015PMC 9545 penetrating fluid (oil type).
       4 P03-017penetrating oil (SPMC 188).
   (4) Clean the repair area by SPOP 208 (Ref. AMM TASK 70-27-00-910-804).
   (5) Do the visual and dimensional inspections of the borescope plug lock counterbore and boss face as follows:
     (a) The counterbore and boss face must have no nicks, burrs, scratches, tool marks, corrosion, wear or damage.
     (b) Counterbore diameter for the borescope AP HPC-7, AP DIFF-1 and AP DIFF-2 plug lock ring must be between 0.475 in. (12.065 mm) and 0.477 in. (12.116 mm) before the installation.
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0043A) ** ON A/C NOT FOR ALL
     (c) Counterbore diameter for the borescope AP HPC-8 plug lock ring must be between 0.757 in. (19.228 mm) and 0.759 in. (19.279 mm) before the installation.
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0043A) ** ON A/C NOT FOR ALL
   (6) Install the new borescope AP HPC-8 plug lock ring with the PWA115141 PUSHER, INSTALLATION on the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP HPC-8 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115141 PUSHER, INSTALLATION.
     (b) Insert the PWA115141 PUSHER, INSTALLATION with the borescope plug lock into the counterbore.
     (c) Tighten the PWA115141 PUSHER, INSTALLATION with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (d) Remove the PWA115141 PUSHER, INSTALLATION.
     (e) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (7) Install the new borescope AP HPC-7 plug lock ring with the PWA115422 PUSHER, INSTALLATION - HPC on the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP HPC-7 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115422 PUSHER, INSTALLATION - HPC.
     (b) Install the borescope AP HPC-7 plug lock ring to the PWA115422 PUSHER, INSTALLATION - HPC.
     (c) Insert the PWA115422 PUSHER, INSTALLATION - HPC with the borescope plug lock into the counterbore.
     (d) Tighten the PWA115422 PUSHER, INSTALLATION - HPC with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (e) Remove the PWA115422 PUSHER, INSTALLATION - HPC.
     (f) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (8) Install the new borescope AP DIFF-1 plug lock ring with the PWA115422 PUSHER, INSTALLATION - HPC on the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP DIFF-1 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115422 PUSHER, INSTALLATION - HPC.
     (b) Install the borescope AP DIFF-1 plug lock ring on the PWA115422 PUSHER, INSTALLATION - HPC.
     (c) Insert the PWA115422 PUSHER, INSTALLATION - HPC with the borescope plug lock into the counterbore.
     (d) Tighten the PWA115422 PUSHER, INSTALLATION - HPC with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (e) Remove the PWA115422 PUSHER, INSTALLATION - HPC.
     (f) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (9) Install the new borescope AP DIFF-2 plug lock ring with the PWA115422 PUSHER, INSTALLATION - HPC on the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush or below the boss surface.
NOTE: The AP DIFF-2 plug lock ring can be installed with the BOLT - WORK (0.250 - 28 IN.) and the WASHER DIA 0,250 IN (6,35 MM), if necessary.
     (a) Apply P03-001lubricant, aircraft turbine engine on the threads and shoulder of the PWA115422 PUSHER, INSTALLATION - HPC.
     (b) Install the borescope AP DIFF-2 plug lock ring on the PWA115422 PUSHER, INSTALLATION - HPC.
     (c) Insert the PWA115422 PUSHER, INSTALLATION - HPC with the borescope plug lock into the counterbore.
     (d) Tighten the PWA115422 PUSHER, INSTALLATION - HPC with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (e) Remove the PWA115422 PUSHER, INSTALLATION - HPC.
     (f) Examine the lock ring.
NOTE: The lock ring must be flush with or below the boss face.
   (10) Install all of the borescope plugs that were removed (Ref. AMM TASK 72-00-00-400-804).
   (11) Examine the assembly for foreign objects, damage and correct assembly.
   (12) Installation of the protection covers:
CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.
     (a) Make sure that you install the COVER - PROTECTION as necessary to prevent damage to the engine.

END OF POST SB C-72-00-0043A (Config-2 Case Assembly Durability Improvement Configuration)

Subtask 72-41-01-920-054-A ** ON A/C NOT FOR ALL
C. Removal and Replacement of the Diffuser Outer Case Borescope Plug Lock Ring

POST SB C-72-00-0098A (Config-3 Improved Assembly Process)

F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0098A) ** ON A/C NOT FOR ALL
   (1) Removal of the protection covers:
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
     (a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine.
   (2) Remove all the external attachments that are necessary to help in the removal and installation of the borescope plug lock(s).
   (3) Remove the loose or damaged borescope AP HPC-7, AP HPC-8, AP DIFF-1 or AP DIFF-2 plug lock ring from the diffuser outer case as follows:
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0098A) ** ON A/C NOT FOR ALL
CAUTION: WHEN YOU REMOVE THE BORESCOPE PLUG LOCK, BE CAREFUL NOT TO CAUSE DAMAGE TO THE DIFFUSER CASE BOSS PARENT MATERIAL.
     (a) Remove the loose or damaged borescope plug lock with the small pry bar.
     (b) Apply penetrating oil to the necessary areas by SPOP 427 before you remove the lock ring, if necessary (Ref. AMM TASK 70-24-00-910-801).
NOTE: These penetrating oils are specially for aluminum, magnesium, titanium, steel, nickel, single crystal and cobalt alloy parts.
       1 P03-016PMC 9503 penetrating fluid (oil type).
       2 PMC 9534 gage lubricant oil (Material No.P03-007) .
       3 P03-015PMC 9545 penetrating fluid (oil type).
       4 P03-017penetrating oil (SPMC 188).
   (4) Clean the repair area by SPOP 208 (Ref. AMM TASK 70-27-00-910-804).
   (5) Do the visual and dimensional inspections of the borescope plug lock counterbore and boss face as follows:
     (a) The counterbore and boss face must have no nicks, burrs, scratches, tool marks, corrosion, wear or damage.
     (b) Counterbore diameter for the borescope AP HPC-7, AP DIFF-1 and AP DIFF-2 plug lock ring must be between 0.475 in. (12.065 mm) and 0.477 in. (12.116 mm) before the installation.
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0098A) ** ON A/C NOT FOR ALL
     (c) Counterbore diameter for the borescope AP HPC-8 plug lock ring must be between 0.757 in. (19.228 mm) and 0.759 in. (19.279 mm) before the installation.
F Replacement of the Diffuser-Outer-Case Borescope Plug-Lock-Ring (POST SB C-72-00-0098A) ** ON A/C NOT FOR ALL
   (6) Install the new borescope AP HPC-8 plug lock ring with the PWA212014 PUSHER, INSTALLATION on the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush.
     (a) Install the borescope AP HPC-8 plug lock ring to the PWA212014 PUSHER, INSTALLATION.
     (b) Insert the PWA212014 PUSHER, INSTALLATION with the borescope plug lock into the counterbore.
     (c) Tighten the PWA212014 PUSHER, INSTALLATION with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (d) Remove the PWA212014 PUSHER, INSTALLATION.
     (e) Examine the lock ring.
NOTE: The lock ring must be flush with boss face.
   (7) Install the new borescope AP HPC-7 plug lock ring with the PWA212004 BORESCOPE LOCK PUSHER on the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush.
     (a) Install the borescope AP HPC-7 plug lock ring to the PWA212004 BORESCOPE LOCK PUSHER.
     (b) Insert the PWA212004 BORESCOPE LOCK PUSHER with the borescope plug lock into the counterbore.
     (c) Tighten the PWA212004 BORESCOPE LOCK PUSHER with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (d) Remove the PWA212004 BORESCOPE LOCK PUSHER.
     (e) Examine the lock ring.
NOTE: The lock ring must be flush with boss face.
   (8) Install the new borescope AP DIFF-1 plug lock ring to the PWA212004 BORESCOPE LOCK PUSHER to the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush.
     (a) Install the borescope AP DIFF-1 plug lock ring to the PWA212004 BORESCOPE LOCK PUSHER.
     (b) Insert the PWA212004 BORESCOPE LOCK PUSHER with the borescope plug lock into the counterbore.
     (c) Tighten the PWA212004 BORESCOPE LOCK PUSHER with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (d) Remove the PWA212004 BORESCOPE LOCK PUSHER.
     (e) Examine the lock ring.
NOTE: The lock ring must be flush with boss face.
   (9) Install the new borescope AP DIFF-2 plug lock ring with the PWA212004 BORESCOPE LOCK PUSHER to the diffuser case as follows:
NOTE: The lock ring installation is done at room temperature using hand tools only. The borescope boss lock insert does not need to be chilled for installation.
NOTE: The lock ring is symmetrical. You cannot install it incorrectly.
NOTE: The borescope plug locks must be flush.
     (a) Install the borescope AP DIFF-2 plug lock ring to the PWA212004 BORESCOPE LOCK PUSHER.
     (b) Insert the PWA212004 BORESCOPE LOCK PUSHER with the borescope plug into the counterbore.
     (c) Tighten the PWA212004 BORESCOPE LOCK PUSHER with the WRENCH - STANDARD and push the borescope plug lock into the counterbore.
     (d) Remove the PWA212004 BORESCOPE LOCK PUSHER.
     (e) Examine the lock ring.
NOTE: The lock ring must be flush with boss face.
   (10) Install all of the borescope plugs that were removed (Ref. AMM TASK 72-00-00-400-804).
   (11) Examine the assembly for foreign, damage and correct assembly.
   (12) Installation of the protection covers:
CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.
     (a) Make sure that you install the COVER - PROTECTION as necessary to prevent damage to the engine.

END OF POST SB C-72-00-0098A (Config-3 Improved Assembly Process)

5. Close-up
Subtask 72-41-01-410-054-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
Subtask 72-41-01-440-052-A ** ON A/C NOT FOR ALL
B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 72-41-01-410-055-A ** ON A/C NOT FOR ALL
C. Close Access
   (1) Remove the access platform(s).
   (2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
   (3) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 02:49:33 UTC
"Aviabrain" 2025