Visual Inspection of the IDG for Oil Leakage Engine Static and Check of the Electrical Circuits

TASK 24-21-00-210-809-A-01
Visual Inspection of the IDG for Oil Leakage Engine Static 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.

CAUTION: DO NOT OPERATE THE IDG:

IF IT CONTAINS TOO MUCH OIL
IF IT DOES NOT CONTAIN ENOUGH OIL

IF YOU DO, YOU CAN CAUSE DAMAGE TO THE IDG.

CAUTION: DO NOT USE SOLVENTS THAT CONTAIN CHLORINE TO CLEAN THE EQUIPMENT (PUMP, HOSES, TANK AND FUNNEL) USED TO FILL THE IDG WITH OIL. CHLORINE CONTAMINATION OF THE OIL CAN CAUSE FAST DETERIORATION OF THE OIL AND WILL DECREASE THE LIFE OF THE IDG.

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, stains or wet areas.
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	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY
No specific	AR	WARNING NOTICE(S)
753970A	1	CSD IDG SYSTEM LEAK TESTER

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
Visual Inspection of the IDG for Oil Leakage Engine Static and Check of the Electrical Circuits

3. Job Set-up
Subtask 24-21-00-941-111-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 24-21-00-010-143-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 24-21-00-210-120-A

A. Oil Leak Test
(1) On the 753970A CSD IDG SYSTEM LEAK TESTER, close the drain valve, refer to the GSE manufacturer's instructions.
(2) Set the shut-off valve to OFF and close the regulator valve to prevent pressure release to the IDG fitting, refer to the GSE manufacturer'sinstructions.
(3) Remove the blanking cap from the pressure fill half-coupling.
(4) Connect one end of the pressure fill hose (1) of the 753970A CSD IDG SYSTEM LEAK TESTER to the pressure fill half-coupling (pressure fill port) of the IDG, refer to the GSE manufacturer's instructions.
(5) Connect the other end of the 753970A CSD IDG SYSTEM LEAK TESTER to a AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY, refer to the GSE manufacturer's instructions.
(6) Turn the shut-off valve to ON and adjust the regulator valve to a pressure of 1.72 bar (24.9465 psi) on the system pressure gauge, refer to the GSE manufacturer's instructions.
(7) Turn the supply valve to OFF to keep the air in the system. , refer to the GSE manufacturer's instructions.

NOTE: Pressure will become stable in the system, with no leak. When the IDG case is vented:

The pressure will decrease to a lightly lower value because of the vent valve setting.
The pressure will stay at this setting.

(8) Monitor the system pressure for five minutes for confirmation of the leak.
(9) Do a visual inspection of these components if there is (are) leak(s):

NOTE: There can be different signs of leaks:

Droplets of oil
Wet areas around connections, oil stripes on the hoses
Stains or discoloration which can occur when oil or grease touches very hot surfaces.

(a) IDG fittings for leakage:

Pressure fill port
Overfill drain port
Oil-in and oil-out ports (cooling circuit interface with the IDG).
Case drain plug.

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 overfill 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 the 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 tubes coupling nuts.
You must replace all tubes that are not in these limits.

2 Attachment

Replace the broken or cracked brackets.
Replace the worn clamps.
Install nuts and bolts, if missing.
Tighten the 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).

(10) 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).
(11) If you cannot find the cause of the leak visually, do a check of the system for for leaks. To do this, use soap suds or equivalent leak detector fluid:

Put a container below the drain valve 753970A CSD IDG SYSTEM LEAK TESTER and open the valve to release the pressure, refer to the GSE manufacturer's.
Make the necessary corrections and put the system back to an operational configuration.
Do the check again to make sure that you repaired the leak.

NOTE: If oil collects in the coalescing filter, use the drain valve at the bottom of the filter housing to drain the oil, refer to the GSE manufacturer's instructions.

NOTE: If you use an AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY, it is necessary to install a plug on the port for the compressed air source, refer to the GSE manufacturer's instructions.

Subtask 24-21-00-210-121-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 24-21-00-410-139-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 23:20:30 UTC