Visual Inspection of the Integrated Drive Generator (IDG) for Oil Leaks and Check of the Electrical Circuits

TASK 24-21-00-210-806-A
Visual Inspection of the Integrated Drive Generator (IDG) for Oil Leaks and Check of the Electrical Circuits

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

ZONE: 453
ZONE: 463

1. Reason for the Job
To make sure that the IDG oil system is serviceable and to do a check for leakage, staining or wetting.
To make sure that the wiring harnesses are in the correct condition.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
453	HOT SECTION
463	HOT SECTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-24-612-803-A	Integrated Drive Generator (IDG) Servicing - Filling of the IDG with Oil or Addition of Oil after a Level Check
TASK 24-21-42-000-802-A	Removal of the IDG Fuel/Oil Heat-Exchanger
TASK 24-21-42-000-803-A	Removal of the IDG Oil/Oil Heat-Exchanger
TASK 24-21-42-400-802-A	Installation of the IDG Fuel/Oil Heat-Exchanger
TASK 24-21-42-400-803-A	Installation of the IDG Oil/Oil Heat-Exchanger
TASK 24-21-51-000-803-A	Removal of the Integrated Drive Generator - IDG 1(2)
TASK 24-21-51-400-803-A	Installation of the Integrated Drive Generator - IDG 1(2)
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 24-21-00-941-099-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 24-21-00-010-126-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR,
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 24-21-00-040-068-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 24-21-00-010-127-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.

4. Procedure
Subtask 24-21-00-210-107-A ** ON A/C NOT FOR ALL

A. Visual Inspection
(1) Do a visual inspection of these components:

NOTE: Do not do the visual inspection for oil leaks at the drain mast.

NOTE: There can be different signs of possible leakage:

Very small drops of oil
Wet areas around the connections
Oil stripes on the tubes
Stains or discoloration which can occur when oil or grease touches very hot surfaces.

(a) IDG fittings for leakage:

The pressure fill port
The overflow drain port
The oil-inlet and oil-outlet ports (cooling circuit interface with the IDG)
The case drain
The vacuum break valve.
If you find an oil leak at:

1 The pressure fill port, replace the pressure fill valve-coupling (Ref. AMM TASK 24-21-51-000-803) and (Ref. AMM TASK 24-21-51-400-803).
2 The overflow drain port, replace the overflow drain valve-coupling (Ref. AMM TASK 24-21-51-000-803) and (Ref. AMM TASK 24-21-51-400-803).
3 The oil-inlet and oil-outlet ports (cooling circuit interface with the IDG) or the case drain, replace the related fitting.
4 The vacuum break valve:

Remove the IDG (Ref. AMM TASK 24-21-51-000-803) .
Send the IDG to the workshop to replace the vacuum break valve.
Install the serviceable IDG (Ref. AMM TASK 24-21-51-400-803) .

(b) External oil circuit (oil lines) for leakage and correct condition:
1 For tubing:

If you find cracks on the tubes, the hoses and the tube coupling nuts, replace them.

2 For attachment:

Replace the broken or the cracked brackets.
Replace the worn clamps.
Install the missing nuts and the bolts.
Tighten the loose nuts and the bolts.

The oil-inlet and oil-outlet ports (cooling circuit interface with the fuel/oil heat-exchanger)
The drain plug
The body of the fuel/oil heat-exchanger.

If you find a leak, replace the IDG fuel/oil heat-exchanger (Ref. AMM TASK 24-21-42-000-802) and (Ref. AMM TASK 24-21-42-400-802).
(d) IDG oil/oil heat-exchanger for leakage:

The oil-inlet and oil-outlet ports (cooling circuit interface with the oil/oil heat-exchanger)
The drain plug
The body of the oil/oil heat-exchanger.

If you find a leak, replace the IDG oil/oil heat-exchanger (Ref. AMM TASK 24-21-42-000-803) and (Ref. AMM TASK 24-21-42-400-803).
(2) If you find components wet with oil, make sure that you find and correct all the causes.
If necessary, fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).

Subtask 24-21-00-210-108-A ** ON A/C NOT FOR ALL

B. Check of the Electrical Circuits
(1) Make sure that the wiring harnesses are in the correct condition.
(2) Make sure that the electrical connectors are correctly connected.

5. Close-up
Subtask 24-21-00-410-122-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL

Subtask 24-21-00-440-065-A ** ON A/C NOT FOR ALL

B. Reactivation of the Thrust Reverser System after Ground Maintenance
(1) Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 24-21-00-410-123-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] 2026.03.31 23:20:25 UTC