W DOC AIRBUS | AMM A320F

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

TASK 24-21-00-710-042-A
Operational Test of the IDG Disconnect and Reconnect Function - Engine Static

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.
ZONE: 438
ZONE: 448
1. Reason for the Job
Refer to the MPD TASK: 242100-09
OPERATIONAL CHECK OF INTEGRATED DRIVE GENERATOR (IDG) DISCONNECT AND RECONNECT FUNCTION.

To do a check of the IDG disconnect system and reset system.
NOTE: This procedure is only applicable for an engine replacement.
NOTE: There is an alternative method that is specially applicable for an IDG replacement, refer to (Ref. TASK 24-21-00-720-042).
2. Job Set-up Information
 A. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
438
FAN COWL
448
FAN COWL
FOR [1000EM1] (ENGINE-1)
438AR
FOR [1000EM2] (ENGINE-2)
448AR
 B. 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 71-13-00-010-010-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)
3. Job Set-up
Subtask 24-21-00-861-051-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 24-21-00-010-051-A ** ON A/C NOT FOR ALL
B. Open the right fan-cowl door (Ref. AMM TASK 71-13-00-010-010):
   (1) FOR [1000EM1] (ENGINE-1)
438AR,
   (2) FOR [1000EM2] (ENGINE-2)
448AR.
Subtask 24-21-00-865-054-A ** ON A/C NOT FOR ALL
C. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
122VUELEC/IDG2/DISC2XTT25
122VUELEC/IDG1/DISC1XTT24
Subtask 24-21-00-865-055-A ** ON A/C NOT FOR ALL
D. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
122VUELEC/GCU/22XU2T27
122VUELEC/GCU/12XU1T26
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 24-21-00-710-051-A ** ON A/C NOT FOR ALL
A. Operational Test of the IDG Disconnect and Reconnect (Reset) Function
NOTE: This test is for the system 1. For the other system(s), use the indications between the parentheses.
ACTION
RESULT
1.On the ELEC control panel 35VU:
  • Lift the guard and push the IDG1(2) pushbutton switch.

2.On the IDG 1(2):
  • Slowly pull out the disconnect reset ring to the full limit of travel. Monitor the hand force that is necessary: this force must not to be too high. The disconnect mechanism must move freely without hard points.
    Let the disconnect reset ring 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 to the full limit of travel.
On the IDG 1(2):
  • The force is much less than in step 2.
  • There is no click.
4.On the panel 35VU:
  • Lower the safety guard.
NOTE: Make sure that the CFDS message IDG 1(2) DISCONNECT goes out of view after the first engine start.
NOTE: When you do the first engine start, make sure that the related engine electrical-generation system operates correctly.

5. Close-up
Subtask 24-21-00-410-051-A ** ON A/C NOT FOR ALL
A. Close the right fan-cowl door (Ref. AMM TASK 71-13-00-410-010):
   (1) FOR [1000EM1] (ENGINE-1)
438AR,
   (2) FOR [1000EM2] (ENGINE-2)
448AR
Subtask 24-21-00-865-056-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
122VUELEC/GCU/22XU2T27
122VUELEC/GCU/12XU1T26
Subtask 24-21-00-862-051-A ** ON A/C NOT FOR ALL
C. 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] 2026.04.01 08:26:25 UTC
"Aviabrain" 2025