Loss of all Signals from the EIU to the FADEC on Engine 1 Channel B

TASK 71-50-00-810-832-A
Loss of all Signals from the EIU to the FADEC on Engine 1 Channel B

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-21-60-000-001	Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001	Installation of the Electronic Control Unit (ECU)
ASM 732510
AMM 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 71-50-00-710-098-A ** ON A/C NOT FOR ALL

A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 71-50-00-810-080-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message J3, EIU:

(1) If the fault continues:

(a) If there is 28VDC:

(2) If the fault continues:

(3) If the fault continues:

Subtask 71-50-00-810-080-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message EIU (ARINC), J3:

(1) If the fault continues:

(a) If there is 28VDC:

(2) If the fault continues:

(3) If the fault continues:

Subtask 71-50-00-710-099-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:35:00 UTC