Repair of the LP Compressor Front Blade Retaining Ring - VRS1810 [IAE]

TASK 72-31-13-300-010-B
Repair of the LP Compressor Front Blade Retaining Ring - VRS1810

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	FILE - FINE
No specific	AR	MACHINE - GRINDING, PORTABLE
No specific	AR	MAGNIFYING GLASS POWER 10X
No specific	AR	MAT - WORK
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V05-019)	Waterproof silicon carbide abrasive paper
(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 Front Blade Retaining Ring - Blend Limits

3. Job Set-up
Subtask 72-31-13-941-053-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).
(4) Install the support equipment
(a) Put the ACCESS PLATFORM 1M(3 FT) in to position to give access to the engine for repair.
(b) Put the MAT - WORK in to position in the air intake cowl.

NOTE: Make sure that the red warning pennants of the workmat can be seen external of the aircraft.

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

4. Procedure
Subtask 72-31-13-350-051-A ** ON A/C NOT FOR ALL

A. Dress and blend damaged areas on the front blade retaining ring

LP Compressor Front Blade Retaining Ring - Blend Limits ** ON A/C NOT FOR ALL

CAUTION: ON TITANIUM COMPONENTS, ONLY SILICON CARBIDE TYPE WHEELS, STONES AND ABRASIVE PAPERS ARE TO BE USED FOR THIS REPAIR. ALUMINIUM OXIDE TYPES MUST NOT BE USED.

CAUTION: THE TITANIUM COMPONENTS WILL OXIDIZE AND CRACK IF MECHANICAL CUTTERS ARE USED HEAVILY. THIS HAS OCCURED IF THE COMPONENT SHOWS DARK STRAW TO BLUE DISCOLORATION. IF AT ANY TIME THIS COLORATION OCCURS, THE RETAINING RING MUST BE REJECTED.

(1) Dress to remove nicks, scratches, dents, galls, burrs and scores from the front blade retaining ring. Use the ABRASIVE WHEEL and MACHINE - GRINDING, PORTABLE or FILE - FINE. Dress until all damage is removed. Use light pressure to prevent the risk that the material will become too hot,
(2) Blend the dressed areas and polish out scores on the front blade retaining ring with Waterproof silicon carbide abrasive paper (Material No.V05-019) waterproof silicon carbide (Material No.V05-020) Waterproof silicon carbide abrasive paper (Material No.V05-021) . The surface finish must be the same as that of the adjacent undressed area.

Subtask 72-31-13-220-051-A ** ON A/C NOT FOR ALL

B. Do a visual check of the front blade retaining ring. Examine for nicks, scratches, dents, galls, burrs and scores with the MAGNIFYING GLASS POWER 10X.

LP Compressor Front Blade Retaining Ring - Blend Limits ** ON A/C NOT FOR ALL

Subtask 72-31-13-230-051-A ** ON A/C NOT FOR ALL

C. Do a penetrant crack test (Ref. AMM TASK 70-23-05-230-010) . If it is cracked, reject it.

5. Close-up
Subtask 72-31-13-942-052-A ** ON A/C NOT FOR ALL

A. Remove the support equipment
(1) Remove the workmat.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:45:11 UTC