Engine 1 does not stop during shut down sequence with FIRE Pushbutton Switch

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1. Possible Causes
· ACTUATOR-LP FUEL VALVE, ENG 1 ( 9QG )
· VALVE-LP FUEL, ENG 1 ( 12QM )
· CHECK VALVE-FUEL RECIRCULATION, L ( 122QM )
· aircraft wiring
· ENG/APU FIRE PNL ( 1WD )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 26-12-12-000-004 Removal of the FIRE Pushbutton Switch (ENG/APU Fire Panel)
Ref. AMM 26-12-12-400-004 Installation of the FIRE Pushbutton Switch (ENG/APU Fire Panel)
Ref. AMM 28-16-00-710-002 Operational Check of Fuel Recirculation Check Valve to Ensure Valve
not Failed Open
Ref. AMM 28-16-42-000-001 Removal of the Fuel Recirculation Check-valve
Ref. AMM 28-16-42-400-001 Installation of the Fuel Recirculation Check-valve
Ref. ASM 28-24-00
Ref. AMM 28-24-41-000-001 Removal of the LP Fuel Valve
Ref. AMM 28-24-41-400-001 Installation of the LP Fuel Valve
Ref. AMM 28-24-51-000-001 Removal of the LP Fuel Valve Actuator
Ref. AMM 28-24-51-400-001 Installation of the LP Fuel Valve Actuator
3. Fault Confirmation
Subtask 73-00-00-710-285-A
A. Test
(1) Not applicable, the fault is evident.
4. Fault Isolation
Subtask 73-00-00-810-204-B
A. If the fault symptom is identified by the crew observation "ENG 1 - During ENG shut down sequence with
FIRE P/B: ENG DOES NOT STOP"
· disconnect the connectors AA and BB from Actuator-LP Fuel Valve (9QG) and make sure that, when
the Fire push button is pushed, there is 28 VDC at pins C of the connectors AA and BB:
(1) If there is 28VDC:
· replace the ACTUATOR-LP FUEL VALVE, ENG 1 ( 9QG ) Ref. AMM 28-24-51-000-001 and Ref.
AMM 28-24-51-400-001
(a) If the fault continues, replace the VALVE-LP FUEL, ENG 1 ( 12QM ) Ref.
AMM 28-24-41-000-001 and Ref. AMM 28-24-41-400-001
(b) If the fault continues, do an operational check of the Check Valve Ref. AMM 28-16-00-710-002 :
1 If the test is correct, no maintenance action is required
2 If the test is not correct, replace the CHECK VALVE-FUEL RECIRCULATION, L ( 122QM )
Ref. AMM 28-16-42-000-001 and Ref. AMM 28-16-42-400-001
(2) If there is no 28VDC:
· do a check of the aircraft wiring between the Actuator-LP Valve and the ENG Fire panel (1WD)
Ref. ASM 28-24-00.
(a) If the wiring is not correct:
· repair the above defective wirings.
(b) If the wiring is correct:
· replace the ENG/APU FIRE PNL ( 1WD ) Ref. AMM 26-12-12-000-004 and Ref.
AMM 26-12-12-400-004 . [Rev.6 from Feb 2017] 2026.04.04 04:36:09 UTC