Removal of the Integrated Drive Generator (IDG) Oil Cooler Tubes and Hoses

TASK 24-21-49-000-803-A
Removal of the Integrated Drive Generator (IDG) Oil Cooler Tubes and Hoses

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.

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	AR	CAP - PROTECTION
No specific	1	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - TORQUE, STANDARD

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-24-680-803-A	Draining of the Oil from the Integrated Drive Generator (IDG)
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
Integrated Drive Generator (IDG) to Oil Cooler Tubing

3. Job Set-up
Subtask 24-21-49-941-055-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 and 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 WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 24-21-49-865-062-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4000XU1 (IDGENG 1)
122VU	ELEC/GCU/1	2XU1	T26
122VU	ELEC/IDG1/DISC	1XT	T24
FOR FIN: 4000XU2 (IDGENG 2)
122VU	ELEC/GCU/2	2XU2	T27
122VU	ELEC/IDG2/DISC	2XT	T25

Subtask 24-21-49-010-059-A

C. 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
(2) Put in position a ACCESS PLATFORM 1M(3 FT).

4. Procedure
Subtask 24-21-49-864-054-A

A. Do the depressurization of the Integrated Drive Generator (IDG) as given in the draining of the oil from the IDG (Ref. AMM TASK 12-13-24-680-803).

Subtask 24-21-49-020-060-A

B. Removal of the Integrated Drive Generator (IDG) to Oil Cooler Tubing
(1) Remove the return hose (1) as follows:

NOTE: The return hose has a larger diameter than the supply hose.

(a) Disconnect the hose (1) from the IDG (2).
(b) Let the hose (1) drain into the CONTAINER 10 L(2 1/2 USGAL).
(c) Use a WRENCH - TORQUE, STANDARD to hold the oil tube (4) while you disconnect the hose (1).
(d) Remove the hose (1) from the engine.
(2) Remove the supply hose (3) as follows:

NOTE: The supply hose has a smaller diameter than the return hose.

(a) Disconnect the hose (3) from the IDG (2).
(b) Let the hose (3) drain into the CONTAINER 10 L(2 1/2 USGAL).
(c) Use a WRENCH - TORQUE, STANDARD to hold the oil tube (5) while you disconnect the hose (3).
(d) Remove the hose (3) from the engine.
(3) Disconnect the oil tubes (4) and (5) from the oil cooler (6) as follows:
(a) Remove the four bolts (8) that attach the flange of the oil tube (4) to the oil cooler (6).
(b) Remove the four bolts (7) that attach the flange of the oil tube (5) to the oil cooler (6).
(c) Remove and discard the gaskets (29) and (30) from the flanges of the oil cooler (6).
(4) Remove the bolts (10), (15), (20), (26), and (33) that attach the return oil tube (oil tube) (4) to the engine.
(5) Remove the oil tube (4) and the saddle clamp (11) from the engine.
(6) If you will install a new oil tube (4), make a record of the position of the four p-clamps to help during installation.
(7) If you will install a new oil tube (4), remove the p-clamps (16), (23), (25), and (32) from the oil tube.
(8) Remove the bolts (9), (14), (19), (27), and (34) that attach the supply oil tube (oil tube) (5) to the engine.
(9) Remove the oil tube (5) and the saddle clamp (12) from the engine.
(10) If you will install a new oil tube (5), do the steps that follow:
(a) Make a record of the position of the four p-clamps to help during installation.
(b) Remove the p-clamps (18), (22), (28), and (35) from the oil tube (5).
(11) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, tubes, hoses and the disconnected connectors.

[Rev.10 from 2021] 2026.04.01 05:44:16 UTC