Removal of the IDG Cooler Hoses

TASK 24-21-55-000-802-A
Removal of the IDG Cooler Hoses

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

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.

CAUTION: DO NOT LET ENGINE OIL FALL ON THE ENGINE OR ADJACENT COMPONENTS. UNWANTED ENGINE OIL MUST BE REMOVED IMMEDIATELY WITH A CLEAN CLOTH. THE ENGINE OIL CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME COMPONENTS.

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	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-21-00-612-804-A	Servicing of the Integrated Drive Generator (IDG) after Oil Chemical Contamination
TASK 24-21-00-612-804-A-01	Servicing of the IDG after Oil Contamination and Extension of the Oil Filter Differential Pressure Indicator (DPI)
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
AC Generator Oil Tubes

3. Job Set-up
Subtask 24-21-55-941-051-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 24-21-55-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR 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 24-21-55-010-051-A ** ON A/C NOT FOR ALL

C. 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 24-21-55-040-050-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser 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 24-21-55-010-052-A ** ON A/C NOT FOR ALL

E. 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
(2) 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 24-21-55-864-051-A ** ON A/C NOT FOR ALL

A. Do the depressurization of the IDG as given in the servicing of the IDG (Ref. AMM TASK 24-21-00-612-804).

Subtask 24-21-55-020-051-A ** ON A/C NOT FOR ALL

B. Removal of the IDG Cooler Hoses

AC Generator Oil Tubes ** ON A/C NOT FOR ALL

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

(1) Find the IDG cooler hoses (1) and (4) attached to the IDG in the 7 o'clock position
(2) Put the CONTAINER 5 L (1.32 USGAL) in position below the IDG cooler hoses (1) or (4) to catch the oil when you disconnect the IDG cooler hoses (1) or (4).
(3) Remove the IDG cooler hose (1)

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE HOSE NUTS. USE ONE WRENCH TO HOLD THE FITTING AND ONE WRENCH TO LOOSEN OR TIGHTEN THE HOSE NUT. IF YOU DO NOT DO THIS, DAMAGE TO THE COMPONENTS CAN OCCUR.

(a) Disconnect the IDG cooler hose (1) from the thermal management system module.
(b) Disconnect the IDG cooler hose (1) from the fitting (6) on the IDG.
(c) Remove the IDG cooler hose (1) from the engine.
(4) Remove the IDG cooler hose (2)

(a) Disconnect the IDG cooler hose (2) from the thermal management system module.
(b) Disconnect the IDG cooler hose (2) from the fitting (3) on the IDG.
(c) Remove the IDG cooler hose (2) from the engine.
(5) If necessary, remove the fitting (6).
(a) Remove the fitting (6) from the IDG.
(b) Remove and discard the preformed packing (5) from the fitting (6).
(6) If necessary, remove the fitting (3).
(a) Remove the fitting (3) from the IDG.
(b) Remove and discard the preformed packing (4) from the fitting (3).

[Rev.10 from 2021] 2026.03.31 23:21:43 UTC