DOC AIRBUS | AMM A320FHigh Pressure Compressor (HPC) On Wing Replacement Repair for Loose, Worn, and Missing Variable Stator Vane (VSV) System Bushings - VRS9344 [IAE]
TASK 75-32-42-960-802-A
High Pressure Compressor (HPC) On Wing Replacement Repair for Loose, Worn, and Missing Variable Stator Vane (VSV) System Bushings - VRS9344
To replace loose, worn and missing bushings
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 75-32-42-941-079-A ** ON A/C NOT FOR ALL
Subtask 75-32-42-020-074-A ** ON A/C NOT FOR ALL
Subtask 75-32-42-410-120-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:12:18 UTC
High Pressure Compressor (HPC) On Wing Replacement Repair for Loose, Worn, and Missing Variable Stator Vane (VSV) System Bushings - VRS9344
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
ZONE: 400
1. Reason for the JobTo replace loose, worn and missing bushings
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 | GAGE 0.025 MM (0.001 IN) - FEELER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 75-32-42-000-010-B | Removal of the VSV Actuating Levers |
| TASK 75-32-42-000-010-B-01 | Removal of the VSV Actuating Levers |
| TASK 75-32-42-200-010-B | Inspection of the VSV Mechanism |
| TASK 75-32-42-200-010-B-01 | Inspection of the VSV Mechanism |
| TASK 75-32-42-400-010-B | Installation of the VSV Actuating Levers |
| TASK 75-32-42-400-010-B-01 | Installation of the VSV Actuating Levers |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
Subtask 75-32-42-941-079-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(3) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).
Subtask 75-32-42-010-118-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on ENG panel 115VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(3) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 75-32-42-040-088-A ** ON A/C NOT FOR ALL (1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
C. Deactivate the thrust reverser.
Subtask 75-32-42-010-119-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).D. Open the thrust reverser halves.
(1) Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
4. Procedure(1) Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
Subtask 75-32-42-020-074-A ** ON A/C NOT FOR ALL
A. If a missing bushing is located on the unison ring connector:
(1) Remove the unison ring connector (Ref. AMM TASK 75-32-42-000-010).
Subtask 75-32-42-020-075-A ** ON A/C NOT FOR ALL (1) Remove the unison ring connector (Ref. AMM TASK 75-32-42-000-010).
B. If a missing bushing is located on the unison ring:
(1) Remove the affected lever arm.
Subtask 75-32-42-160-050-A ** ON A/C NOT FOR ALL (1) Remove the affected lever arm.
C. If required, remove residual bushing material.
(1) Use the standard workshop equipment.
Subtask 75-32-42-210-064-A ** ON A/C NOT FOR ALL (1) Use the standard workshop equipment.
D. Visually examine the bushing holes.
(1) Determine if a bushing hole has any indications of wear and damage on the unison ring.
(a) If it does, reject the engine.
(2) Determine if a bushing hole has any indications of wear and damage on unison ring connector.
(a) If it does, reject the unison ring connector.
Subtask 75-32-42-210-065-A ** ON A/C NOT FOR ALL (1) Determine if a bushing hole has any indications of wear and damage on the unison ring.
(a) If it does, reject the engine.
(2) Determine if a bushing hole has any indications of wear and damage on unison ring connector.
(a) If it does, reject the unison ring connector.
E. Examine the Variable Stator Vane (VSV) levers and pins.
(1) Visually inspect the Variable Stator Vane (VSV) levers and pins for evidence of wear and damage.
(2) If it is damaged or if the wear is evident, replace the VSV lever.
Subtask 75-32-42-420-078-A ** ON A/C NOT FOR ALL (1) Visually inspect the Variable Stator Vane (VSV) levers and pins for evidence of wear and damage.
(2) If it is damaged or if the wear is evident, replace the VSV lever.
F. Install the replacement bushings.
(1) Install the required bushing(s):
(a)
Typical view of the High Pressure Compressor (HPC) Variable Stator Vane (VSV) Unison Ring with the Connector ** ON A/C NOT FOR ALL
(2) Make sure that the busings are in place.
(a) Use the standard equipment.
Subtask 75-32-42-210-066-A ** ON A/C NOT FOR ALL (1) Install the required bushing(s):
(a)
Typical view of the High Pressure Compressor (HPC) Variable Stator Vane (VSV) Unison Ring with the Connector ** ON A/C NOT FOR ALL (a) Use the standard equipment.
G. Visually examine the bushings.
(1) Visually inspect to confirm that the bushings are installed correctly.
(2) If the bushing has a flange, use the GAGE 0.025 MM (0.001 IN) - FEELER to make sure that the bushings are correctly seated and that the safety features are engaged.
Subtask 75-32-42-420-079-A ** ON A/C NOT FOR ALL (1) Visually inspect to confirm that the bushings are installed correctly.
(2) If the bushing has a flange, use the GAGE 0.025 MM (0.001 IN) - FEELER to make sure that the bushings are correctly seated and that the safety features are engaged.
H. Installation of the unison ring connector.
(1) Install the unison ring connector (Ref. AMM TASK 75-32-42-400-010).
Subtask 75-32-42-970-052-A ** ON A/C NOT FOR ALL (1) Install the unison ring connector (Ref. AMM TASK 75-32-42-400-010).
I. Identify the repair.
(1) Make a record of the VRS9344 in the applicable engine documentation.
Subtask 75-32-42-200-057-A ** ON A/C NOT FOR ALL (1) Make a record of the VRS9344 in the applicable engine documentation.
J. Inspection after 50 flight cycles.
(1) Inspect the VSV mechanism (Ref. AMM TASK 75-32-42-200-010).
(a) Inspect the replaced VSV bushings after 50 flight cycles to confirm that the bushing is in place.
5. Close-up(1) Inspect the VSV mechanism (Ref. AMM TASK 75-32-42-200-010).
(a) Inspect the replaced VSV bushings after 50 flight cycles to confirm that the bushing is in place.
Subtask 75-32-42-410-120-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
Subtask 75-32-42-440-073-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
B. Activate the thrust reverser.
(1) Reactivate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).
Subtask 75-32-42-410-121-A ** ON A/C NOT FOR ALL (1) Reactivate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).