Operational Test of the IDG Disconnect and Reconnect Function - Engine Static

TASK 24-21-00-710-803-A
Operational Test of the IDG Disconnect and Reconnect Function - Engine Static

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: 454
ZONE: 455

1. Reason for the Job
Refer to the MPD TASK: 242100-22
OPERATIONAL CHECK OF INTEGRATED DRIVE GENERATOR (IDG) DISCONNECT AND RECONNECT FUNCTION.

To do a check of the IDG disconnect system and the IDG reset system.

NOTE: This procedure is specially applicable for an engine replacement.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	Torque wrench: range to between 22 and 20 lbf.in (0.25 and 0.23 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
454	HOT SECTION
455	EXHAUST NOZZLE
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 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 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
IDG - Reset Ring

3. Job Set-up
Subtask 24-21-00-861-074-A ** ON A/C NOT FOR ALL

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).
(3) On the ECAM control panel, push the ELEC key to get the ELEC page.

Subtask 24-21-00-941-097-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 24-21-00-865-087-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ELEC/GCU/2	2XU2	T27
122VU	ELEC/GCU/1	2XU1	T26

Subtask 24-21-00-865-086-A ** ON A/C NOT FOR ALL

D. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	ELEC/IDG2/DISC	2XT	T25
122VU	ELEC/IDG1/DISC	1XT	T24

Subtask 24-21-00-010-116-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR

Subtask 24-21-00-040-064-A ** ON A/C NOT FOR ALL

F. 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 24-21-00-010-117-A ** ON A/C NOT FOR ALL

G. 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

CAUTION: ENGAGE THE IDG DISCONNECT MECHANISM WITH THE DISCONNECT RESET RING BEFORE YOU START THE ENGINE. IF NOT YOU WILL CAUSE DAMAGE TO THE DOG TEETH, AT ENGINE START.

CAUTION: DO NOT PUSH THE IDG DISCONNECT PUSHBUTTON SWITCH FOR MORE THAN 3 SECONDS. THERE MUST BE AT LEAST 60 SECONDS BETWEEN TWO OPERATIONS OF THE SWITCH. THIS IS TO PREVENT DAMAGE TO THE DISCONNECT SOLENOID WHICH WILL BECOME TOO HOT.

Subtask 24-21-00-720-063-A ** ON A/C NOT FOR ALL

A. Operational Test of the IDG Disconnect and Reconnect (Reset) Function - Engine Static

NOTE: This test is for the system 1. For the other system(s), use the indications between the parentheses.

NOTE: Two persons are necessary to do the test: one person holds the disconnect reset ring while the other person pushes the IDG pushbutton switch in the cockpit on ELEC control panel 35VU.

ACTION	RESULT
1.On ELEC control panel 35VU: Lift the guard and push the IDG1(2) pushbutton switch.
2.On the IDG 1(2): Remove the screw (3) and disengage the loop clamp (2) from the disconnect reset ring (1). Slowly pull out the disconnect reset ring (1) to the full limit of travel. Monitor the hand force that is necessary (this force must not be too high). The disconnect mechanism must move freely without hard points. Let the disconnect reset ring (1) go slowly back to the initial position.	On the IDG 1(2): If you feel a click while you hold the disconnect reset ring, this shows that the disconnect function operates correctly.
CAUTION: MAKE SURE THAT THERE IS CORRECT RESET OF THE IDG DISCONNECT MECHANISM. IF THE RESET IS NOT CORRECT, YOU MUST REMOVE AND REPLACE THE IDG BEFORE THE NEXT FLIGHT. 3.On the IDG 1(2): Again, slowly pull out the disconnect reset ring (1) to the full limit of travel. Let the disconnect reset ring (1) go slowly back to the initial position. Install the loop clamp (2) on the disconnect reset ring (1) and attach the loop clamp with the screw (3). TORQUE the screw to between 22 and 20 lbf.in (0.25 and 0.23 m.daN ) .	On the IDG 1(2): The force is much less than in step 2. There is no click.
4.On ELEC control panel 35VU: Lower the safety guard of the IDG1(2) pushbutton switch.

NOTE: When you do the first engine start, make sure that the related engine electrical-generation system operates correctly.

NOTE: If you do not get a correct reset of the IDG 1(2) disconnect mechanism after you obeyed the instructions given in steps 1.through 4., you must replace the IDG 1(2).

5. Close-up
Subtask 24-21-00-410-114-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 24-21-00-440-061-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 24-21-00-410-115-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).

Subtask 24-21-00-865-088-A ** ON A/C NOT FOR ALL

D. 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
122VU	ELEC/GCU/2	2XU2	T27
122VU	ELEC/GCU/1	2XU1	T26

Subtask 24-21-00-862-073-A ** ON A/C NOT FOR ALL

E. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:20:09 UTC