Cleaning of the Main Gearbox with a Chemical Agent [PW11]

TASK 72-61-01-100-801-A
Cleaning of the Main Gearbox with a Chemical Agent

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Use this procedure to clean the main grearbox with a chemical agent.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth
(Material No.P11-014)	PMC 9094 isopropyl alcohol
(Material No.P11-027)	PMC 9001 petroleum solvent
(Material No.P11-039)	PMC 9060 cleaner solvent
(Material No.P11-049)	aqueous cleaner

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-804-A	SPOP 208 - Degreasing of Parts by Solvent Wiping
TASK 70-27-00-910-805-A	SPOP 209 - Degreasing of Parts by Aqueous Cleaning
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors

3. Job Set-up
Subtask 72-61-01-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

Subtask 72-61-01-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.

Subtask 72-61-01-040-050-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 72-61-01-010-051-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.

4. Procedure
Subtask 72-61-01-100-050-A ** ON A/C NOT FOR ALL

A. Cleaning of the Main Gearbox with a Cleaning Agent
(1) Find the main gearbox installed approximately at the 6 o'clock position attached to the diffuser.
(2) Clean the main gearbox with the aqueous degreasing method:

WARNING: MAKE SURE THE ENGINE IS COOL TO THE TOUCH BEFORE YOU APPLY THE SOLVENTS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONNEL AND/OR DAMAGE TO THE ENGINE CAN OCCUR.

(a) Clean the main gearbox with the aqueous degreasing method (Ref. AMM TASK 70-27-00-910-805).

NOTE: This cleaning method is optional to the solvent wipe method (SPOP 208).

(b) Clean the main gearbox with aqueous cleaner (Material No.P11-049) .

CAUTION: KEEP THE COMPRESSED AIR AT A PRESSURE EQUAL TO OR BELOW 30 PSIG (206.8 kPa). IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ENGINE CAN OCCUR.

NOTE: You can use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to help dry the main gearbox faster.

(3) Clean the main gearbox with the solvent wipe method:

WARNING: MAKE SURE THE ENGINE IS COOL TO THE TOUCH BEFORE YOU APPLY THE SOLVENTS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONNEL AND/OR DAMAGE TO THE ENGINE CAN OCCUR.

(a) Clean the main gearbox with the solvent wipe method (Ref. AMM TASK 70-27-00-910-804).

NOTE: This cleaning method is optional to the aqueous degreasing method (SPOP 209).

(b) Clean the main gearbox surface with a lint-free cotton cloth (Material No.P05-005) and one of the cleaning agents from the list below:
1 PMC 9094 isopropyl alcohol (Material No.P11-014)
2 PMC 9001 petroleum solvent (Material No.P11-027)
3 PMC 9060 cleaner solvent (Material No.P11-039) .

CAUTION: KEEP THE COMPRESSED AIR AT A PRESSURE EQUAL TO OR BELOW 30 PSIG (206.8 kPa). IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ENGINE CAN OCCUR.

NOTE: You can use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to help dry the main gearbox faster.

5. Close-up
Subtask 72-61-01-410-050-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 cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.

Subtask 72-61-01-440-050-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 72-61-01-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:03:20 UTC