Repair of Loose or Damaged Variable Stator Vane Actuator (VSVA) Pin on the High Pressure Compressor (HPC) Front Cases - VRS9317 [IAE]

TASK 75-32-41-300-801-A
Repair of Loose or Damaged Variable Stator Vane Actuator (VSVA) Pin on the High Pressure Compressor (HPC) Front Cases - VRS9317

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

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.

WARNING: BE CAREFUL DURING THE REMOVAL/INSTALLATION OF THE VARIABLE STATOR VANE ACTUATOR. IT WEIGHS 10lb (4.5kg).

CAUTION: DO NOT LET ENGINE FUEL OR OIL FALL ON THE ENGINE. UNWANTED FUEL OR OIL MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FUEL OR OIL CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

1. Reason for the Job
Replacement of loose or damaged Variable Stator Vane Actuator (VSVA) pins on the HPC front case
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	DRY-ICE
No specific	AR	PLUG - BLANKING
No specific	AR	WARNING NOTICE(S)
IAE3P16643	1	GUIDE TOOL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-11-50-100-802-A	Local Swab or Wipe Cleaning with Solvent
TASK 70-23-05-230-010-A	Local Application of Fluorescent Penetrant Inspection
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 75-32-41-000-010-A	Removal of the Variable Stator Vane (VSV) Actuator
TASK 75-32-41-400-010-A	Installation of the Variable Stator Vane (VSV) Actuator
TASK 75-32-41-400-010-A-01	Installation of the Variable Stator Vane (VSV) Actuator (SBE 75-0122, Type G4000VSVA Series)
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
Location of VSVA Pin Assembly

3. Job Set-up
Subtask 75-32-41-941-056-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a 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 a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 75-32-41-010-069-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.

Subtask 75-32-41-040-063-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Ground Maintenance

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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-012).

Subtask 75-32-41-010-070-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 75-32-41-010-071-A ** ON A/C NOT FOR ALL

E. Remove the VSVA (Ref. AMM TASK 75-32-41-000-010).

4. Procedure

CAUTION: IF THE HOLES ARE DAMAGED OR IF YOU CANNOT GET THE INTERFERENCE FIT, YOU MUST NOT DO THIS REPAIR ON-WING. YOU MUST REMOVE THE ENGINE AND SEND IT TO THE WORKSHOP FOR REPAIR. IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE EQUIPMENT CAN OCCUR.

Subtask 75-32-41-020-066-A ** ON A/C NOT FOR ALL

A. Removal of the Loose, Damaged or Sheared Pin(s) and Retaining Ring(s)

Location of VSVA Pin Assembly ** ON A/C NOT FOR ALL

(1) Remove the loose, damaged or sheared pin(s) and retaining ring(s):
(a) Use a standard workshop equipment or the IAE3P16643 GUIDE TOOL and do the steps that follow:
1 Identify the forward or aft VSVA pin that is damaged.
2 Loosen tube part number 6A2150 to get sufficient space to drill.
3 Loosen tube part number 6A2133 to get sufficient space to drill.
4 Disconnect junction line 740-5277-509 and the adjacent junction lines to get sufficient space to drill.
5 Put the PLUG - BLANKING on all the VSVA lines that are open from the removal of the VSVA, to prevent fuel leakage.
6 Mount the VSVA drill guide-tool (IAE 3P16643-7) and install the renewable bushing (IAE 3P16643-3) in the drill guide tool.

NOTE: Make sure that the drill guide is centered in relation to the locating pin holes.

7 Use the end mill bit (IAE 3P16643-15) if the sheared pin is jagged (as needed) to prevent drill wobble.
8 Use the drill bit (IAE 3P16643-17) and install the depth collar and set the drill bit to 1.634 in. (41.50 mm) depth on the drill bit.

CAUTION: DO NOT APPLY FORCE ON THE DRILL BIT. IF YOU DO NOT OBEY THIS PRECAUTION, YOU CAN CAUSE DAMAGE TO THE BUSHING AND THE ADJACENT AREAS.

9 Insert the drill bit into the bushing (IAE 3P16643-3) and slowly start drilling. Proceed with caution, stopping periodically to clean metal chips from the drill hole and to lubricate the drill bit until the set depth is reached on the depth collar. Use compressed air to clean the hole.
10 Remove the renewable bushing (IAE 3P16643-3) from the tool and install the bushing (IAE 3P16643-10) from the kit in the drill guide tool.
11 Install the depth collar on the drill bit (IAE 3P16643-16) and set the drill bit to 1.634 in. (41.50 mm) (CPM alloy drill bit or carbide drill bit only) and lubricate the drill bit before drilling.

CAUTION: DO NOT APPLY FORCE ON THE DRILL BIT. IF YOU DO NOT OBEY THIS PRECAUTION, YOU CAN CAUSE DAMAGE TO THE BUSHING AND THE ADJACENT AREAS.

12 Insert the drill bit into the bushing (IAE 3P16643-10) and slowly start drilling. Proceed with caution, stopping periodically to clean chips from the drill hole and to lubricate the drill bit until the set depth is reached to the depth collar. Use compressed air to clean the hole.
13 Remove the drill guide tool (IAE 3P16643-7) from the case.
14 Spray the drilled hole with the tapping oil.

NOTE: Allow the tapping oil to penetrate through the cavity behind the pin before proceeding.

15 Insert the threaded tap (IAE 3P16643-18) into the drilled pin hole to create threads for the pin extractor tool.

NOTE: Make sure that the tap is centered and straight when inserted into the locating pin holes.

NOTE: The pin may come out during the tapping process.

16 Install the drill guide tool (IAE 3P16643-7) on the case.

NOTE: Make sure that the drill guide is centered in relation to the locating pin holes.

17 Install the VSVA pin extractor-tool (IAE 3P16643-12).
18 Install the shoulder bolt (IAE 3P16643-13) through the jam nut (IAE 3P16643-14) and the extractor sleeve (IAE 3P16643-12).
19 Thread one shoulder bolt into the drilled and tapped pin.
20 Tighten the jam nut (IAE 3P16643-14) with a wrench, the shoulder bolt (IAE 3P16643-13) and the extractor sleeve (IAE 3P16643-12) should get flush with the case. The thin-walled pin should now be extracted onto the shoulder bolt out of the pin hole.
21 Once the pin is removed, go to Paragraph 4.B.

Subtask 75-32-41-110-057-A ** ON A/C NOT FOR ALL

B. Solvent-wipe the repair area(s) (Ref. AMM TASK 70-11-50-100-802).

Subtask 75-32-41-230-050-A ** ON A/C NOT FOR ALL

C. Do a penetrant crack test of the repair area(s) identified with circles

Location of VSVA Pin Assembly ** ON A/C NOT FOR ALL

(Ref. AMM TASK 70-23-05-230-010).
(1) Use ultra high sensitivity.
(2) Cracks are not permitted.

Subtask 75-32-41-220-053-A ** ON A/C NOT FOR ALL

D. Examine the pin hole(s):
For Assembly A, B, C

Location of VSVA Pin Assembly ** ON A/C NOT FOR ALL

(1) Visually examine and measure the dimensions of the pin hole(s).
(a) Use workshop inspection equipment.
(2) You must get an interference of 0.00008 in. (0.002 mm) to 0.00126 in. (0.032 mm) between the hole(s) and the pin(s).
(3) If the hole(s) is/are damaged or the interference cannot be met, this repair cannot be performed.

Subtask 75-32-41-420-081-A ** ON A/C NOT FOR ALL

E. Install the pin(s) and retaining ring(s) into the HP compressor front case assembly:
For Assembly A, B, C

Location of VSVA Pin Assembly ** ON A/C NOT FOR ALL

(1) Chill the pin(s).
(a) Use the replacement VSVA pin P/Ns AS20745, 01-460 or 6A5956, 01-461 or 6A5957, 01-462 as necessary.
(b) Unless specified differently, use liquid nitrogen or DRY-ICE (solidified carbon dioxide) to chill the part.
(2) Assemble the retaining ring(s) and the pin(s).
(a) Use AS20763 (3 off), 01-459, as necessary.
(3) Install the retaining ring(s) and pin(s) into the HP compressor front case assembly.
(a) Make sure that the pin(s) is/are located correctly until the temperature of the pin(s) and the temperature of the HP compressor front case assembly become the same.

Subtask 75-32-41-210-050-A ** ON A/C NOT FOR ALL

F. Examine the pin(s):

Location of VSVA Pin Assembly ** ON A/C NOT FOR ALL

(1) Visually examine and measure the dimensions of the installed pin(s).
(a) Make sure that the pin(s) is (are) installed correctly.
(2) Record the repair in the log book.
(3) Tighten all the loose tubes and assemble the tubes to get the initial configuration.

5. Close-up
Subtask 75-32-41-410-066-A ** ON A/C NOT FOR ALL

A. Install the VSVA (Ref. AMM TASK 75-32-41-400-010).

Subtask 75-32-41-410-067-A ** ON A/C NOT FOR ALL

B. 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 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 75-32-41-440-059-A ** ON A/C NOT FOR ALL

C. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-012).

Subtask 75-32-41-410-068-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:11:56 UTC