Visual Inspection of the IDG for Oil Leaks and Check of the Electrical Circuits

TASK 24-21-00-210-809-A
Visual Inspection of the IDG for Oil Leaks and Check of the Electrical Circuits

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: WEAR GOGGLES, INSULATED GLOVES AND OTHER PROTECTIVE CLOTHES. HOT OIL CAN BURN YOUR EYES AND SKIN. IF OIL TOUCHES YOUR EYES OR SKIN, GET MEDICAL AID.

ZONE: 435
ZONE: 445

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	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-24-612-804-A	Integrated Drive Generator (IDG) Servicing - Filling of the IDG with Oil or Addition of Oil after a Level Check
TASK 24-21-51-000-806-A	Removal of the Integrated Drive Generator (IDG) - IDG 1(2)
TASK 24-21-51-400-806-A	Installation of the Integrated Drive Generator (IDG) - IDG 1(2)
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 73-11-50-000-802-A	Removal of the Integrated Drive Generator (IDG) Oil Cooler
TASK 73-11-50-400-802-A	Installation of the Integrated Drive Generator (IDG) Oil Cooler

3. Job Set-up
Subtask 24-21-00-941-109-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 a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 24-21-00-010-141-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

4. Procedure
Subtask 24-21-00-210-119-A

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

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

NOTE: There can be different signs of possible leakage:

Droplets of oil
Wet areas around connections, oil stripes on tubes
Stains or discoloration which can occur when oil or grease is in contact with very hot surfaces.

(a) IDG fittings for leakage:

Pressure fill port
Overflow drain port
Oil-in and oil-out ports (cooling circuit interface with the IDG)
Case drain.
If you find an oil leak at:
The pressure fill port, replace the pressure fill half-coupling (Ref. AMM TASK 24-21-51-000-806) and (Ref. AMM TASK 24-21-51-400-806).
The overflow drain port, replace the overflow drain half-coupling (Ref. AMM TASK 24-21-51-000-806) and (Ref. AMM TASK 24-21-51-400-806).
The oil-in and oil-out ports (cooling circuit interface with IDG) or case drain, replace the related fitting.

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

No cracks are permitted on tubes, hoses and tube coupling nuts.

2 Attachment

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

Oil-in and oil-out ports (cooling circuit interface with the cooler)
Drain plug
Body of the cooler.

If you find a leak, replace the IDG oil cooler (Ref. AMM TASK 73-11-50-000-802) and (Ref. AMM TASK 73-11-50-400-802).
(2) If you find components wet with oil, make sure that you find and correct all the causes.
If necessary, fill the oil tank (Ref. AMM TASK 12-13-24-612-804).

Subtask 24-21-00-210-122-A

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 24-21-00-410-137-A

A. 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] 2026.03.31 23:20:29 UTC