Repair of the LP Compressor Inlet Guide Vanes - VRS1850 [IAE]

TASK 72-32-91-300-010-B
Repair of the LP Compressor Inlet Guide Vanes - VRS1850

CAUTION: YOU MUST USE SILICON CARBIDE WHEELS, SILICON CARBIDE STONES, SILICON ABRASIVE PAPERS TO REPAIR THE INLET GUIDE VANES.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ABRASIVE WHEEL
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	MACHINE - GRINDING, PORTABLE
No specific	AR	MAT - WORK
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V05-020)	waterproof silicon carbide
(Material No.V05-021)	Waterproof silicon carbide abrasive paper

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-05-230-010-A	Local Application of Fluorescent Penetrant Inspection
LP Compressor Inlet Guide Vanes

3. Job Set-up
Subtask 72-32-91-941-062-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 72-32-91-941-063-A ** ON A/C NOT FOR ALL

B. Put the ground support equipment in to position
(1) Put the ACCESS PLATFORM 1M(3 FT) in position to give access to the engine.
(2) Put the MAT - WORK in the air intake cowl.

NOTE: Make sure that you can see the red warning pennants of the workmat externally.

NOTE: Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the air intake cowl surface.

4. Procedure
Subtask 72-32-91-350-052-A ** ON A/C NOT FOR ALL

A. Repair of the LP compressor inlet-guide-vanes

LP Compressor Inlet Guide Vanes ** ON A/C NOT FOR ALL

CAUTION: YOU MUST MAKE LIGHT CUTS WITH THE MECHANICAL CUTTER. HEAVY CUTS WILL CAUSE THE MATERIAL TO OXIDISE AND CRACK. IF THE BLADE SHOWS DARK STRAW TO BLUE DISCOLORATION THE BLADE MUST BE REJECTED.

CAUTION: YOU MUST USE SILICON CARBIDE WHEELS, SILICON CARBIDE STONES OR SILICON CARBIDE ABRASIVE PAPERS TO REPAIR THE INLET GUIDE VANES.

(1) Remove nicks, scratches and/or damage from the vane with the ABRASIVE WHEEL and MACHINE - GRINDING, PORTABLE or the fine file. Make sure all the damage is removed.
(2) Make the repaired area smooth and polish out scores on the vane with the waterproof silicon carbide (Material No.V05-020) and Waterproof silicon carbide abrasive paper (Material No.V05-021) . Polish marks must be in a radial direction (from the ID to the OD of the vane). The surface finish must be the same as the adjacent area.
(3) Use the waterproof silicon carbide (Material No.V05-020) and Waterproof silicon carbide abrasive paper (Material No.V05-021) , to make smooth and polish the leading/trailing edge radius. Polish marks must be in a radial direction (From the ID to the OD of the vane).

Subtask 72-32-91-220-051-A ** ON A/C NOT FOR ALL

B. Do a detailed and dimensional check of the vane

LP Compressor Inlet Guide Vanes ** ON A/C NOT FOR ALL

Subtask 72-32-91-230-052-A ** ON A/C NOT FOR ALL

C. Do a penetrant crack test (Ref. AMM TASK 70-23-05-230-010).

5. Close-up
Subtask 72-32-91-942-056-A ** ON A/C NOT FOR ALL

A. Remove the ground support equipment
(1) Remove the workmat from the air intake cowl.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:46:00 UTC