System Test of the IDG Frequency (P/N 740119)

TASK 24-21-00-730-040-A
System Test of the IDG Frequency (P/N 740119)

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.

1. Reason for the Job
Make sure that the steady-state operating frequency of the IDG is between 390 and 410 Hz.
If the frequency of the IDG is out of the specified limits, but is between 380 and 420 Hz, the display of the IDG frequency on the ECAM ELEC page becomes amber. Do these steps:

remove the IDG from the engine gearbox,
adjust the frequency of the IDG,
install the IDG on the engine gearbox.

If the frequency of the IDG is out of the limits 380 - 420 Hz, replace the IDG.

NOTE: You cannot get access to the frequency adjustment screw when the IDG is on the engine.
The adjustment of the frequency is permitted only one time each 400FH. If you adjust the governor, make an entry in the aircraft technical logbook.

2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-21-51-000-040-A	Removal of the Integrated Drive Generator - IDG 1(2)
TASK 24-21-51-000-040-B	Removal of the Integrated Drive Generator - IDG 1(2)
TASK 24-21-51-400-040-A	Installation of the Integrated Drive Generator - IDG 1(2)
TASK 24-21-51-400-040-E	Installation of the Integrated Drive Generator (IDG) 1(2) (New EPGS)
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 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-003-B	Engine Automatic Start
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-00-00-710-028-B	Engine Shutdown
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
Governor Adjustment Screw - IDG

3. Job Set-up
Subtask 24-21-00-010-056-A ** ON A/C NOT FOR ALL

A. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 24-21-00-860-050-A ** ON A/C NOT FOR ALL

B. 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, get the ELEC page.
(4) Start the related engine (Ref. AMM TASK 71-00-00-710-003).

Subtask 24-21-00-865-057-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
122VU	ELEC/IDG1/DISC	1XT	T24
FOR FIN: 1000EM2 (ENGINE2)
122VU	ELEC/IDG2/DISC	2XT	T25

4. Procedure

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

CAUTION: DO NOT ADJUST THE GOVERNOR MORE THAN 1 TIME EACH 400 FH. IF YOU ADJUST THE GOVERNOR, MAKE AN ENTRY IN THE AIRCRAFT TECHNICAL LOGBOOK.

Subtask 24-21-00-730-050-A ** ON A/C NOT FOR ALL

A. Test of the IDG Frequency

ACTION	RESULT
1.On the ECAM control panel: Get the ELEC page	On the lower ECAM display unit: Read the operating frequency of the generator (IDG1 or IDG2) to calculate the value of the necessary adjustment. NOTE: The normal operating frequency of the generator is 400 + or - 5 Hertz.
2.Shut down the engine (Ref. AMM TASK 71-00-00-710-028).
3.Remove the IDG from the engine gearbox (Ref. AMM TASK 24-21-51-000-040).
4.Remove the lockwire from the governor adjustment screw (2).
5.Adjust the frequency to 400 + or - 1 Hertz. To do this, turn the adjustment screw (2): Clockwise to decrease the frequency, Or counterclockwise to increase the frequency. NOTE: One full turn of the adjustment screw changes the frequency by 3 to 3.5 Hertz.
6.Safety the adjustment screw (2) with lockwire. Do this carefully not to change the setting of the adjustment screw.
7.Install the IDG on the engine gearbox (Ref. AMM TASK 24-21-51-400-040).
8.Start the related engine (Ref. AMM TASK 71-00-00-710-003).	On the lower ECAM display unit: Check the frequency (400 Hz + or - 5Hz).

Subtask 24-21-00-730-050-B ** ON A/C NOT FOR ALL

A. Test of the IDG Frequency

ACTION	RESULT
1.On the ECAM control panel: Get the ELEC page	On the lower ECAM display unit: Read the operating frequency of the generator (IDG1 or IDG2) to calculate the value of the necessary adjustment. NOTE: The normal operating frequency of the generator is 400 + or - 5 Hertz.
2.Shut down the engine (Ref. AMM TASK 71-00-00-710-028).
3.Remove the IDG from the engine gearbox (Ref. AMM TASK 24-21-51-000-040).
4.Remove the lockwire from the governor adjustment screw (2).
5.Adjust the frequency to 400 + or - 1 Hertz. To do this, turn the adjustment screw (2): Clockwise to decrease the frequency, Or counterclockwise to increase the frequency. NOTE: One full turn of the adjustment screw changes the frequency by 3 to 3.5 Hertz.
6.Safety the adjustment screw (2) with lockwire. Do this carefully not to change the setting of the adjustment screw.
7.Install the IDG on the engine gearbox (Ref. AMM TASK 24-21-51-400-040).
8.Start the related engine (Ref. AMM TASK 71-00-00-710-003).	On the lower ECAM display unit: Check the frequency (400 Hz + or - 5Hz).

5. Close-up
Subtask 24-21-00-860-055-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Shut down the engine (Ref. AMM TASK 71-00-00-710-028).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 24-21-00-410-056-A ** ON A/C NOT FOR ALL

B. Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

[Rev.10 from 2021] 2026.03.31 23:20:06 UTC