Fuel-Crossfeed Valve opens or closes slowly.

TASK 28-23-00-810-805-A
Fuel-Crossfeed Valve opens or closes slowly.

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

WARNING: WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT: EN50020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.

1. Possible Causes

ACTUATOR-FUEL CROSSFEED VALVE [5QE]
VALVE-FUEL CROSSFEED [10QM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 28-23-00-720-001	Operational Test of Crossfeed Valve Using Individual Motors: ...
AMM 28-23-41-000-001	Removal of the Fuel Crossfeed Valve
AMM 28-23-41-400-001	Installation of the Fuel Crossfeed Valve
AMM 28-23-51-000-001	Removal of the Crossfeed Valve Actuator
AMM 28-23-51-400-001	Installation of the Crossfeed Valve Actuator

3. Fault Confirmation
Subtask 28-23-00-700-053-A

A. Do the operational test of the crossfeed valve using individual motors AMM 28-23-00-720-001. Make a record of the time it takes for the actuator to get to the open and the closed position.

4. Fault Isolation
Subtask 28-23-00-810-054-A

A. If the crossfeed valve takes more than 6 seconds to go to the open or the closed position.
(1) Replace the ACTUATOR-FUEL CROSSFEED VALVE [5QE] AMM 28-23-51-000-001 and AMM 28-23-51-400-001.
(2) If the fault continues:

replace the VALVE-FUEL CROSSFEED [10QM] AMM 28-23-41-000-001 and AMM 28-23-41-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:28:40 UTC