Check of the AC Main Generation Maintenance Condition

TASK 24-20-00-040-001-A
Check of the AC Main Generation Maintenance Condition

CAUTION: IF THE IDG OPERATES IN THE DISCONNECTED MODE:

DO NOT CONNECT IT AGAIN.
MAKE SURE THAT THE IDG DOES NOT OPERATE FOR MORE THAN 50 HOURS IN THE DISCONNECTED MODE.
AFTER A MAXIMUM OF 50 HOURS IN THE DISCONNECTED MODE, REPLACE IT AND SEND THE REMOVED IDG FOR A SHOP INSPECTION.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE BALL BEARING ASSEMBLY ON THE INPUT SHAFT AND THE AIRCRAFT ENGINE CAN OCCUR.

NOTE: The procedure is same for the IDG 1(2).

1. Reason for the Job
MMEL 24-22-01A
AC MAIN GENERATION (IDG, GCU, LINE CONTACTOR)
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 49-90-00-600-004-A	Check Oil Level and Replenish (APS 3200)
TASK 49-90-00-600-007-A	Check Oil Level and Replenish (131-9(A))
Oil Consumption of the APU GTCP 36-300
Oil Consumption of the APU APS 3200
Oil Consumption of the APU 131-9(A)

3. Job Set-up
Subtask 24-20-00-860-050-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

4. Procedure
Subtask 24-20-00-210-054-B

A. CAUTION to Prevent Damage to IDG

CAUTION: REPLACE THE IDG1(2) BEFORE NEXT ENGINE START IF:

THE IDG1(2) WAS MECHANICALLY DISCONNECTED, AND
THE FAULT MESSAGE "IDG1(E1-4000XU) OIL DELTA TEMP/GCU1 (1XU1)" OR "IDG2(E2-4000XU) OIL DELTA TEMP/GCU2 (1XU2)" IS THEN SHOWN ON THE PFR OR LAST LEG REPORT. THIS FAULT MESSAGE SHOWS THAT THE IDG IS STILL MECHANICALLY CONNECTED. THIS CAN CAUSE HEAVY DAMAGE TO THE IDG AT THE NEXT ENGINE START.

(1) On the lower ECAM DU, on the ELEC page, make sure that the IDG 1(2) DISC message is shown.

NOTE: This is only applicable if one generator is inoperative and the cause of the dispatch under MMEL 24-22-01A was one of these warning messages:

ELEC IDG 1(2) OIL LO PR
ELEC IDG 1(2) OIL OVHT.

Subtask 24-20-00-040-051-C ** ON A/C NOT FOR ALL

B. Fuel recirculation Check
(1) On the ECAM control panel, push the STS key.
(2) On the lower ECAM display unit, make sure that the "ENG 1(2) FADEC" message does not come into view on the STATUS page.
(a) If the message comes into view for the engine with the IDG in operation:

Make sure that none of the messages that follow come into view:
. ACOC OIL TEMP TC/HC/EEC
. IDG OIL TEMP TC/HC/EEC
. ACOC AIR MOD VLV/HC/EEC
. FUEL DIV RET VLV/HC/EEC
. HMS FUEL OVTMP
. HMS ENG OIL OVTMP
. HMS IDG OIL OVTMP
. HMS IDG OVTMP W/RECIRC
. FUEL DIV RET VLV/EEC

(3) On the maintenance panel 50VU:

Release the ENG/FADEC GND PWR/1(2) pushbutton switch(es) (the ON legend(s) come(s) on).

Subtask 24-20-00-710-050-A ** ON A/C NOT FOR ALL

C. Do this test:

ACTION	RESULT
1.On one MCDU, get the SYSTEM REPORT/TEST ENG menu page.
2.On the MCDU, on the ENG menu page: push the line key adjacent to the FADEC 1A(2A) indication.	On the MCDU: the FADEC 1A(2A) page comes into view.
3.On the FADEC 1A(2A) page: push the line key adjacent to the LAST LEG REPORT indication.	On the MCDU: make sure that there is no message related to the control system of the fuel return valve.
4.On the MCDU: push the line key adjacent to the RETURN indication until the ENG menu page comes into view.
5.On the MCDU, on the ENG menu page: push the line key adjacent to the FADEC 1B(2B) indication.	On the MCDU: the FADEC 1B(2B) page comes into view.
6.On the FADEC 1B(2B) page: push the line key adjacent to the LAST LEG REPORT indication.	On the MCDU: make sure that there is no message related to the control system of the fuel return valve.
7.On the MCDU: push the MCDU MENU mode key.

Subtask 24-20-00-210-053-A

D. Check of the APU Oil Consumption
(1) If you do a regular monitoring of the APU oil consumption, make sure that the APU oil quantity is sufficient for the flight:

For the GTCP 36-300
Oil Consumption of the APU GTCP 36-300
or
For the APS 3200
Oil Consumption of the APU APS 3200
or
For the 131-9(A)
Oil Consumption of the APU 131-9(A)

(2) If you do not do a regular monitoring of the APU oil consumption, do the steps that follow to make sure that the APU oil quantity is sufficient for the flight:
(a) Make sure that APU LOW OIL LEVEL indication is not shown:
1 On the ECAM control panel, push the APU key (on the lower ECAM DU, the APU page comes into view).
2 Make sure that the APU LOW OIL LEVEL indication is not shown.
(b) Make sure that there are no oil leaks:
1 Start and operate the APU:

For the GTCP 36-300 (Ref. AMM D/O 49-00-00-86), or
For the APS 3200 (Ref. AMM TASK 49-00-00-860-005), or
For the 131-9(A) (Ref. AMM TASK 49-00-00-860-008).

2 During APU operation:

Do a check for oil smell in the passenger compartment.
Do a check for white smoke from the APU exhaust.

NOTE: An oil smell in the passenger compartment shows that there is an internal and/or external oil leakage.

NOTE: Smoke from APU exhaust shows that there is an internal oil leakage.

3 Stop the APU:

For the GTCP 36-300 (Ref. AMM D/O 49-00-00-86), or
For the APS 3200 (Ref. AMM TASK 49-00-00-860-006), or
For the 131-9(A) (Ref. AMM TASK 49-00-00-860-009).

For the GTCP 36-300 (Ref. AMM D/O 49-90-00-60) , or
For the APS 3200 (Ref. AMM TASK 49-90-00-600-004), or
For the 131-9(A) (Ref. AMM TASK 49-90-00-600-007).

NOTE: During the oil level check, make sure that there is no external oil leakage in the APU compartment.

Subtask 24-20-00-710-056-B ** ON A/C NOT FOR ALL

E. Check of the IDG Heat-Exchanger Bypass-Valves
(1) Make sure that the messages that follow are not shown on the last PFR leg:

IDG 1(2) COOLER BYPASS VALVE
IDG 1(2) (E1(2)-4000XU)/IDG 1(2) COOLER BYPASS VALVE.

5. Close-up
Subtask 24-20-00-860-051-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) On the panel 50VU:

push the ENG/FADEC GND PWR/1(2) pushbutton switch(es) (the ON legend(s) go(es) off).

(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) Make an entry in the logbook to show that the IDG is connected or disconnected.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 24-20-00-860-051-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) Make an entry in the logbook to show that the IDG is connected or disconnected.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:19:25 UTC