Failure of the FRV of the Engine 2 in the Closed Position, on Channel B

TASK 73-10-00-810-820-A
Failure of the FRV of the Engine 2 in the Closed Position, on Channel B

1. Possible Causes

harness J8
fuel return valve
ECU [4000KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-11-50-000-002	Removal of the Fuel Return Valve (FRV)
AMM 73-11-50-400-002	Installation of the Fuel Return Valve
AMM 73-21-50-000-041	Removal of the HJ8 Harness for SAC Engines
AMM 73-21-50-400-041	Installation of the HJ8 Harness for SAC Engines
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 732518
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 73-10-00-710-086-A ** ON A/C NOT FOR ALL

A. Not applicable.

4. Fault Isolation
Subtask 73-10-00-810-073-A ** ON A/C NOT FOR ALL

A. The fault is generated when the fuel return valve fails to reach the opened position when commanded by the ECU.
(1) Inspect the J8 harness and associated connectors for sign of damage or contamination ASM 732518.
(2) If damage is found:

replace the harness J8 AMM 73-21-50-000-041 and AMM 73-21-50-400-041.

(3) If nothing is found:

replace the fuel return valve AMM 73-11-50-000-002 and AMM 73-11-50-400-002.

(4) If the fault continues:

replace the harness J8 AMM 73-21-50-000-041 and AMM 73-21-50-400-041.

(5) If the fault continues:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

Subtask 73-10-00-710-087-A ** ON A/C NOT FOR ALL

B. Test sensor to force the opening of the fuel return valve.
(1) Perform an operational test with engine motoring AMM 73-29-00-710-040 and check that the fault does not duplicate.

[Rev.8 from Aug 2018] 2026.04.04 04:35:14 UTC