Inspection of the VSV Mechanism [IAE]

TASK 75-32-42-200-010-B
Inspection of the VSV Mechanism

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.

CAUTION: MAKE SURE THAT ALL THE RIG PINS ARE REMOVED BEFORE THE ENGINE IS OPERATED. THE VSV MECHANISM WILL BE DAMAGED IF THE PINS ARE NOT REMOVED AND THE ENGINE IS OPERATED.

CAUTION: DO NOT LET THE VSVS MOVE THROUGH THE LOW OR HIGH SPEED POSITIONS WHEN THE CRANKSHAFT IS TURNED. THE ENGINE CAN BE DAMAGED INTERNALLY.

ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This task is for A5 basic (non SelectOne) engines and A5 SelectOne retrofit engines, which have not SBE 72-0564 incorporated.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 370 and 290 lbf.in (4.18 and 3.28 m.daN )
IAE1P16614	1	PIN, RIGGING
IAE1R18254	1	PIN RIGGING
IAE1R18282	1	PIN, RIGGING
IAE1R18423	1	PIN, RIGGING
IAE1R18891	1	PIN, RIGGING

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
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 75-32-42-640-010-B	Lubrication of HP Compressor Variable Stator Vane (VSV) Mechanism
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
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
VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122)
VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122)
VSV Mechanism
Unison Ring Rig Pin Brackets
VSV Crankshaft and Unison Rings (PRE SBE 75-0122)
Variable Stator Vane Actuator (V2500-A5 All Type G4000VSVA Series POST SB 75-0122)

3. Job Set-up
Subtask 75-32-42-941-057-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the 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) to tell persons not to energize the FADEC 1(2).

Subtask 75-32-42-010-073-A ** ON A/C NOT FOR ALL

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 the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 75-32-42-040-062-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser.

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).

Subtask 75-32-42-010-058-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 75-32-42-010-059-A ** ON A/C NOT FOR ALL

A. Disconnect the VSV actuator:

VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism ** ON A/C NOT FOR ALL

(1) Remove the nut (2), the washer (1) and the bolt (4). Disconnect the rod (3) from the actuator.

Subtask 75-32-42-220-054-A ** ON A/C NOT FOR ALL

B. Do a Check of the VSV Rigging

VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism ** ON A/C NOT FOR ALL

Unison Ring Rig Pin Brackets ** ON A/C NOT FOR ALL

NOTE: Do not attempt to make any adjustment to the VSV rigging. If misalignment is more than one quarter of a rig pin hole contact IAE technical services for further instructions.

NOTE: It is recommended to visually examine the alignment of rig pin holes before you try to install the rig pins. If the rig pin holes are misaligned not more than one quarter of a rig pin hole, accept it.

(1) Use an applicable wrench, on the wrench flats of the crankshaft, and turn the crankshaft to the high speed position and align the rig pin holes.
(2) Install the IAE1R18254 PIN RIGGING through the rig pin holes in the crankshaft front bearing housing and the crankshaft.
(3) Use the IAE1R18423 PIN, RIGGING for VIGV.
(4) Install the IAE1R18423 PIN, RIGGING, into the rig pin bracket on the VIGV unison ring.
(5) Make sure that the rig pin engages with the hole in the compressor case.
(6) Remove the rig pin from the unison ring.
(7) Do again steps (3) thru (5) for the unison rings at stages 3, 4, 5.
(8) If the rig pin cannot be easily installed at one or more of the positions, examine the VSV system levers and control rods for bends. Go to steps D.(1)(a) and D.(2)(a).
(9) Remove the rig pin from the crankshaft.

Subtask 75-32-42-220-055-A ** ON A/C NOT FOR ALL

C. Do a check of the force necessary to move the VSV mechanism.

VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism ** ON A/C NOT FOR ALL

(1) Put a torque wrench with an applicable wrench adaptor on to the wrench flats of the crankshaft. Measure the torque necessary to turn the crankshaft from the low speed position to the high speed position. If the torque necessary is more than to 350 lbf.in (3.96 m.daN) then lubricate the system in accordance with (Ref. AMM TASK 75-32-42-640-010). Measure the torque after lubrication. If still in excess of 350 lbf.in (3.96 m.daN) reject engine.

Subtask 75-32-42-210-053-A ** ON A/C NOT FOR ALL

D. Examine the levers and the control rods.

VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism ** ON A/C NOT FOR ALL

(1) Examine the levers for bends or cracks:
(a) If one or more of the levers are bent or cracked, reject the engine.
(2) Examine the control rods for bends:
(a) If one or more of the control rods are bent, reject the engine.

Subtask 75-32-42-220-059-A ** ON A/C NOT FOR ALL

E. Lock the Actuator and the Crank Assembly

VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Crankshaft and Unison Rings (PRE SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism ** ON A/C NOT FOR ALL

PRE SB 75-0122 (Type 1685 or 2607 Series Actuator)

(1) Move the actuator ram to the high speed position (ram retracted) so that the fork end is against the high speed stop.

NOTE: Use a WRENCH - STANDARD on the flats on the crank to move the VSVs to the high speed position.

(2) Position the ram to align the rig pin slot in the fork end with the hole in the rig pin housing.
(3) Installation of the rigging pin:

CAUTION: YOU MUST MAKE SURE THAT THE RIG PIN IAE1R18282 OR IAE1R18891 IS FULLY AND CORRECTLY INSTALLED IN THE VSV ACTUATOR. IF YOU DO NOT DO THIS, THE AVAILABLE POWER FROM THE ENGINE CAN BE DECREASED.

(a) Install the IAE1R18891 PIN, RIGGING or IAE1R18282 PIN, RIGGING through the rig pin housing and the actuator ram fork end.

NOTE: Turn the rig pin actuator ram fork end to align the rig pin holes in the fork end and the rig pin housing if the rig pin cannot be fully installed.

(b) Visually inspect to ensure the proper rig pin engagement into the fork end slot.

VSV Crankshaft and Unison Rings (PRE SBE 75-0122) ** ON A/C NOT FOR ALL

(4) Install the IAE1R18254 PIN RIGGING in the crank assembly.

END OF PRE SB 75-0122 (Type 1685 or 2607 Series Actuator)

Subtask 75-32-42-220-063-A ** ON A/C NOT FOR ALL

F. Lock the Actuator and the Crank Assembly

Variable Stator Vane Actuator (V2500-A5 All Type G4000VSVA Series POST SB 75-0122) ** ON A/C NOT FOR ALL

POST SB 75-0122 (Type G4000VSVA Series)

(1) Move the actuator ram to the high speed position (ram retracted) so that the fork end is against the high speed stop.
(a) Use the WRENCH - STANDARD on the flats on the crank to move the VSVs to the high speed position.

NOTE: The type G4000VSVA series rig pin housing is on the rear side of the ram when you look at it from the front of the engine.

(2) Position the ram to align the rig pin slot in the fork end with the hole in the rig pin housing.

CAUTION: MAKE SURE THAT YOU INSTALL THE RIG PIN IAE1P16614 FULLY AND CORRECTLY IN THE VSV ACTUATOR. IF YOU DO NOT OBEY THIS PRECAUTION, THE AVAILABLE POWER IN THE ENGINE CAN DECREASE.

(3) Installation of the rig pin:

NOTE: Do not use the old IAE1R18282 PIN, RIGGING or IAE1R18891 PIN, RIGGING for the new type G4000VSVA series actuator. Be sure to install IAE1P16614 PIN, RIGGING.

(a) Install the IAE1P16614 PIN, RIGGING through the rig pin housing and the actuator ram fork end.
1 Move the actuator ram fork end to align the rig pin slot in the fork end and the rig pin hole in the rig pin housing if the rig pin cannot be fully installed.

NOTE: VSV actuator IAE1P16614 PIN, RIGGING will engage to pin shoulder completely. There should not be any gap to indicate a proper rig pin installation into the actuator fork end slot.

Variable Stator Vane Actuator (V2500-A5 All Type G4000VSVA Series POST SB 75-0122) ** ON A/C NOT FOR ALL

(b) Make sure that IAE1P16614 PIN, RIGGING is properly engaged into the fork end slot.

Variable Stator Vane Actuator (V2500-A5 All Type G4000VSVA Series POST SB 75-0122) ** ON A/C NOT FOR ALL

(4) Install the IAE1R18254 PIN RIGGING in the crank assembly.

END OF POST SB 75-0122 (Type G4000VSVA Series)

Subtask 75-32-42-210-058-A ** ON A/C NOT FOR ALL

CAUTION: WHEN YOU DO THIS TASK, BE CAREFUL NOT TO CAUSE DAMAGE TO THE VSVA SERVO-VALVE COVER.

G. Examine the unison ring and unison ring connectors for missing, loose and/or worn bushings.

PRE SB 72-0418 Unison ring and unison ring connectors consisting of an inner and outer bushing.

(1) One stage - One inner bushing and one outer bushing at different locations.
(a) Replace within 100 cycles (Ref. AMM TASK 75-32-42-960-802).
(b) If you cannot replace the bushing, reject the engine.
(2) One stage - One inner bushing and one outer bushing at same location.
(a) Accept and inspect again the engine within 50 cycles from the initial inspection.

NOTE: If the bushing is replaced prior for this inspection, this step can be skipped and repair details are to be followed.

(b) Replace the bushing(s) after 100 cycles from the initial inspection (Ref. AMM TASK 75-32-42-960-802).
(c) If you cannot replace the bushing, reject the engine.
(3) Multiple stages and/or multiple locations, both inner bushing and outer bushing.
(a) Replace within two cycles (Ref. AMM TASK 75-32-42-960-802).
(b) If you cannot replace the bushing, reject the engine.

Subtask 75-32-42-210-059-A ** ON A/C NOT FOR ALL

CAUTION: WHEN YOU DO THIS TASK, BE CAREFUL NOT TO CAUSE DAMAGE TO THE VSVA SERVO-VALVE COVER.

H. Examine the unison ring and unison ring connectors for missing, loose and/or worn bushings.

SB 72-0418 Unison ring and unison ring connectors consisting of an inner and outer bushing.

(1) One location one stage.
(a) Accept and inspect again the engine within 50 cycles from the initial inspection.

NOTE: If the bushing(s) is (are) replaced prior for this inspection, this step can be skipped and repair details are to be followed.

(b) Replace the bushing(s) after 100 cycles from the initial inspection (Ref. AMM TASK 75-32-42-960-802).
(c) If you cannot replace the bushing(s), reject the engine.
(2) One location multiple stages / multiple locations, one or more stages.
(a) Replace the bushing(s) within two cycles (Ref. AMM TASK 75-32-42-960-802).
(b) If you cannot replace the bushing, reject the engine.

Subtask 75-32-42-410-073-A ** ON A/C NOT FOR ALL

I. Connect the VSV actuator.

VSV Crankshaft and Unison Rings (PRE SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism (POST SBE 72-0538) (PRE OR POST SBE 75-0122) ** ON A/C NOT FOR ALL

VSV Mechanism ** ON A/C NOT FOR ALL

(1) Put the rod (3) in position on the actuator.
(2) Install the bolt (4), the washer (1) and the nut (2).

NOTE: When assembling the bolt make sure that the shoulder of the VSV actuator fork is visible and the actuator fork and D-head bolt are assembled in the correct orientation.

(3) TORQUE the nut to between 370 and 290 lbf.in (4.18 and 3.28 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Subtask 75-32-42-010-096-A ** ON A/C NOT FOR ALL

J. Remove the rigging pins
(1) Remove the IAE1R18254 PIN RIGGING and IAE1R18891 PIN, RIGGING or IAE1R18282 PIN, RIGGING and IAE1P16614 PIN, RIGGING.

5. Close-up
Subtask 75-32-42-410-082-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 75-32-42-440-056-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 75-32-42-410-074-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (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).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 03:12:16 UTC