The steady-state Operating Frequency of the Integrated Drive Generator (IDG1) is out of the 390Hz-410Hz range

TASK 24-21-00-810-811-A
The steady-state Operating Frequency of the Integrated Drive Generator (IDG1) is out of the 390Hz-410Hz range

1. Possible Causes

EGIU-1 [22XU1]
IDG [4000XU]
GCU-1 [1XU1]
IDG-ENG 1 [4000XU1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-21-00-730-040	System Test of the IDG Frequency (P/N 740119)
AMM 24-21-51-000-040	Removal of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-000-803	Removal of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-400-040	Installation of the Integrated Drive Generator - IDG 1(2)
AMM 24-21-51-400-803	Installation of the Integrated Drive Generator - IDG 1(2)
AMM 24-22-33-000-001	Removal of the EGIU-1(2)
AMM 24-22-33-400-002	Installation of the EGIU-1(2)
AMM 24-22-34-000-001	Removal of the GCU-1(2)
AMM 24-22-34-400-001	Installation of the GCU-1(2)
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 31-60-00-860-001	EIS Start Procedure
AMM 31-60-00-860-002	EIS Stop Procedure
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-027	Engine Shutdown
AMM 71-00-00-860-814	Shutdown of the Engine
AMM 71-00-00-860-823	Start the Engine (Normal Automatic Start)

3. Fault Confirmation
Subtask 24-21-00-860-050-B ** ON A/C NOT FOR ALL

A. Job Set-up
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(c) Start the engine 1 AMM 71-00-00-710-003.

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

Subtask 24-21-00-710-066-B

B. Test

ACTION	RESULT
1.On the ECAM control panel: push the ELEC key to get the ELEC page.	On the lower ECAM DU: the frequency parameter of the IDG1 is amber. NOTE: In normal operation, the color of the IDG frequency parameter is green.

4. Fault Isolation
Subtask 24-21-00-810-060-B ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

replace the EGIU-1 [22XU1] AMM 24-22-33-000-001 and AMM 24-22-33-400-002.

(1) If the IDG1 frequency parameter stays amber:
(a) The frequency parameter value is out of the 390Hz-410Hz range:

adjust the IDG1 frequency AMM 24-21-00-730-040.

1 If the IDG1 frequency parameter stays amber:

replace the IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

(b) The frequency parameter value is out of the 363Hz-433Hz range:

replace the IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

Subtask 24-21-00-810-060-D ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

replace the GCU-1 [1XU1] AMM 24-22-34-000-001 and AMM 24-22-34-400-001.

(1) The frequency parameter value stays amber:

replace the IDG [4000XU] AMM 24-21-51-000-040 and AMM 24-21-51-400-040.

Subtask 24-21-00-810-060-F ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

Replace GCU-1 [1XU1] AMM 24-22-34-000-001 and AMM 24-22-34-400-001.

(1) The frequency parameter value stays amber:

Replace IDG-ENG 1 [4000XU1] AMM 24-21-51-000-803 and AMM 24-21-51-400-803.

Subtask 24-21-00-710-067-B

B. Do the test given in Para. 3.

5. Close-up
Subtask 24-21-00-860-051-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Stop the engine 1 AMM 71-00-00-710-027.
(2) Do the EIS stop procedure
AMM 31-60-00-860-002.
(3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

Subtask 24-21-00-860-051-E ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Stop engine 1 AMM 71-00-00-860-814.
(2) Do the EIS stop procedure
AMM 31-60-00-860-002.
(3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:26:30 UTC