Removal of the IDG Oil/Oil Heat-Exchanger

TASK 24-21-42-000-803-A
Removal of the IDG Oil/Oil Heat-Exchanger

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.

WARNING: WAIT FIVE MINUTES MINIMUM TO MAKE SURE THAT THE OIL SYSTEM IS NOT PRESSURIZED BEFORE YOU DO THIS PROCEDURE. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

ZONE: 451
ZONE: 461
FIN: 5002XM1 ** ON A/C NOT FOR ALL
FIN: 5002XM2 ** ON A/C NOT FOR ALL

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	CONTAINER 20L (5 USGAL)
No specific	AR	COVER - PROTECTION

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-24-680-802-A	Draining of the Oil from the Integrated Drive Generator (IDG)
TASK 24-21-42-400-803-A	Installation of the IDG Oil/Oil Heat-Exchanger
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 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
IDG Oil/Oil Heat-Exchanger

3. Job Set-up
Subtask 24-21-42-941-054-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 24-21-42-010-063-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 24-21-42-040-055-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System for Ground 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 24-21-42-010-064-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.
(3) Installation of the engine protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Install all the necessary COVER - PROTECTION to prevent damage to the engine.

4. Procedure
Subtask 24-21-42-864-051-A ** ON A/C NOT FOR ALL

A. Do the draining of the oil from the IDG (Ref. AMM TASK 12-13-24-680-802).

Subtask 24-21-42-020-068-A ** ON A/C NOT FOR ALL

B. Removal of the IDG Oil/Oil Heat-Exchanger

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Find the IDG oil/oil heat-exchanger (3) on the engine at approximately the nine o'clock position.
(2) Put a CONTAINER 20L (5 USGAL) below the IDG oil/oil heat-exchanger.
(3) Make sure that the oil system is not pressurized:
(a) Wait five minutes after the engine shutdown.
(b) Open the oil tank cap to make sure that there is no pressure in the oil system.
(c) Close and lock the oil tank cap.
(4) Remove the IDG oil/oil heat-exchanger (3):
(a) Remove the five bolts (1) and the five washers (2).
(b) Remove the IDG oil/oil heat-exchanger (3).
(c) Use the lint-free cotton cloth (Material No.P05-005) to clean any excess oil.
(d) Remove the seal (4).

NOTE: The seal (4) may be reused later (Ref. AMM TASK 24-21-42-400-803).

[Rev.10 from 2021] 2026.03.31 23:20:53 UTC