Loss of the ECAM and EFIS Displays during Engine Start at IDG 1 Connection

TASK 24-20-00-810-858-A
Loss of the ECAM and EFIS Displays during Engine Start at IDG 1 Connection

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-860-823	Start the Engine (Normal Automatic Start)

3. Fault Confirmation
Subtask 24-20-00-710-093-B ** ON A/C NOT FOR ALL

A. Test
(1) Start the engine 1 AMM 71-00-00-710-003.
(2) The fault is confirmed if during the engine start:

the ECAM and EFIS display units go blank with a diagonal line for more than one second,
and the IDG 1 is connected below 50% N2.

Subtask 24-20-00-710-093-F ** ON A/C NOT FOR ALL

A. Test
(1) Start engine 1 AMM 71-00-00-860-823.
(2) The fault is confirmed if, during the engine start:

The ECAM DU and EFIS DU show only a diagonal line for more than one second, and IDG 1 connects at less than 50% N2.

4. Fault Isolation
Subtask 24-20-00-810-105-B ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

do a check of the resistance of the IDG 1 MPU coil between pin B/1 and pin B/2 (17.5 ohms plus or minus 3.5 ohms at 25 deg.C (77 deg.F)).

(1) If the resistance value is out of the specified limits:

Subtask 24-20-00-810-105-F ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

Do a check of the resistance of the IDG 1 MPU coil between pin B/1 and pin B/2 (17.5 ohms plus or minus 3.5 ohms at 25 deg.C (77 deg.F)).

(1) If the resistance value is out of the specified limits:

Subtask 24-20-00-710-094-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:26:15 UTC