Cleaning of the Transfer Gearbox (TGB) Assembly [CFML]

TASK 72-62-00-100-801-A
Cleaning of the Transfer Gearbox (TGB) Assembly

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

CAUTION: DO NOT LET OIL GET ON THE ENGINE OR OTHER COMPONENTS. IMMEDIATELY CLEAN THE OIL WHEN IT FALLS ON THEM. OIL CAN CAUSE DAMAGE TO EQUIPMENT.

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	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2010)	white spirit
(Material No.CP2011)	stoddard solvent
(Material No.CP2442)	engine oil
No specific	lint-free cloth

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 72-62-00-000-802-A	Removal of the Transfer Gearbox Assembly
TASK 72-62-00-400-802-A	Installation of the Transfer Gearbox Assembly
Cleaning of the Transfer Gearbox (TGB) Assembly

3. Job Set-up
Subtask 72-62-00-941-058-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the 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 72-62-00-010-064-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 72-62-00-020-055-A

C. Make sure that the Transfer Gearbox (TGB) Assembly is removed (Ref. AMM TASK 72-62-00-000-802).

4. Procedure
Subtask 72-62-00-110-050-A

A. Cleaning of the TGB Assembly

NOTE: If the engine is exposed to unusual operating conditions, make sure that any sign of defects are correctly written and documented before the parts are sent for cleaning operations.

(1) Clean the TGB assembly (1) as follows:
(a) Remove oil, grease and loose dirt from the TGB (1).
1 Clean the components with a lint-free cloth, using stoddard solvent (Material No.CP2011) or white spirit (Material No.CP2010) .
(b) Lubricate all bearings with engine oil (Material No.CP2442) .
(c) Seal all gearbox openings to prevent entrance of moisture.

5. Close-up
Subtask 72-62-00-420-059-A

A. Install the TGB Assembly (Ref. AMM TASK 72-62-00-400-802).

Subtask 72-62-00-410-063-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:04:32 UTC