Loss of the FADEC Cooling on Engine 1

TASK 75-24-00-810-803-A
Loss of the FADEC Cooling on Engine 1

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)
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 75-24-49-210-040	Visual inspection of the ECU Air Cooling Tubes and Ducts

3. Fault Confirmation
Subtask 75-24-00-710-050-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 75-24-00-810-068-E ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ECU (OVERTEMP):

replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001.
do a check of the ECU cooling air system for blockage of the inlet and outlet AMM 75-24-49-210-040.

Subtask 75-24-00-710-051-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:37:05 UTC