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

TASK 24-21-00-210-048-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.

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 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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
753970A	1	CSD IDG SYSTEM LEAK TESTER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
438AR
FOR [1000EM2] (ENGINE-2)
448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-24-612-011-A	Integrated Drive Generator (IDG) Servicing - Filling of the IDG with Oil or Addition of Oil after a Level Check
TASK 24-21-42-000-010-B	Removal of the Fuel-Cooled IDG Oil-Cooler
TASK 24-21-42-400-010-B	Installation of the Fuel-Cooled IDG Oil-Cooler
TASK 24-21-49-200-010-A	General Check of the IDG Oil Cooling Tubes
TASK 24-21-51-000-010-A	Removal of the Integrated Drive Generator -IDG 1(2)
TASK 24-21-51-400-010-B	Installation of the Integrated Drive Generator - IDG 1(2), (New EPGS)
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Connection of the Test Tool to the IDG

3. Job Set-up
Subtask 24-21-00-941-088-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).

Subtask 24-21-00-865-072-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: 4000XU (IDG) FOR FIN: 1000EM1 (ENGINE1)
122VU	ELEC/GCU/1	2XU1	T26
122VU	ELEC/IDG1/DISC	1XT	T24
FOR FIN: 4000XU (IDG) FOR FIN: 1000EM2 (ENGINE2)
122VU	ELEC/GCU/2	2XU2	T27
122VU	ELEC/IDG2/DISC	2XT	T25

Subtask 24-21-00-010-101-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the right fan-cowl door (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
438AR
(b) FOR [1000EM2] (ENGINE-2)
448AR

4. Procedure
Subtask 24-21-00-210-092-A ** ON A/C NOT FOR ALL

A. Oil Leak Test
(1) On the tool 753970A CSD IDG SYSTEM LEAK TESTER, turn the drain valve to the off position.
(2) Set the shut-off valve to OFF and close the regulator valve to prevent pressure release to the IDG fitting.
(3) Remove the dust cap from the pressure fill half-coupling.
(4) Connect one end of the pressure fill hose of the tool to the pressure fill half-coupling (pressure fill port) of the IDG.
(5) Connect the other end of the tool 753970A CSD IDG SYSTEM LEAK TESTER to an AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.
(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.
(7) Turn the supply valve to OFF to keep the air in the system.

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 in case of confirmed leak(s):

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 24-21-51-000-010) and (Ref. AMM TASK 24-21-51-400-010).
The overflow drain port, replace the overflow drain half-coupling (Ref. AMM TASK 24-21-51-000-010) and (Ref. AMM TASK 24-21-51-400-010).
The oil-in and oil-out ports (cooling circuit interface with IDG) or case drain, replace the related fitting.

(b) IDG oil cooling tubes for leakage and correct condition (Ref. AMM TASK 24-21-49-200-010).
(c) IDG oil cooler for leakage:

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 24-21-42-000-010) and (Ref. AMM TASK 24-21-42-400-010).
(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 12-13-24-612-011).
(11) If the visual check does not locate the leak source, do a check of the system for leaks. To do this, use soap suds or equivalent leak detector fluid:

Put an appropriate container below the drain valve and open the valve to release the pressure.
Make the necessary corrections and restore the system to an operational configuration.
Do the check again to make sure that the leak was corrected.

NOTE: If oil collects in the coalescing filter, use the drain valve a the bottom of the filter housing to drain the oil.

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.

Subtask 24-21-00-210-094-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 24-21-00-410-100-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right fancowl door (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
438AR
(b) FOR [1000EM2] (ENGINE-2)
448AR.

Subtask 24-21-00-865-073-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4000XU (IDG) FOR FIN: 1000EM1 (ENGINE1)
122VU	ELEC/GCU/1	2XU1	T26
122VU	ELEC/IDG1/DISC	1XT	T24
FOR FIN: 4000XU (IDG) FOR FIN: 1000EM2 (ENGINE2)
122VU	ELEC/GCU/2	2XU2	T27
122VU	ELEC/IDG2/DISC	2XT	T25

Subtask 24-21-00-942-055-A ** ON A/C NOT FOR ALL

C. Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:20:23 UTC