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R  1_  If the test is correct, no maintenance action is required
R  2_  If the test is not correct, replace the Check Valve (122QM)
R  (Ref. AMM TASK 28-16-42-000-001) and (Ref. AMM TASK 28-16-42-
R  400-001) 
R  (2) If there is no 28VDC: 
R  - do a check of the aircraft wiring between the Actuator-LP Valve and 
R  the ENG Fire panel (1WD) (Ref. ASM 28-24/00). 
R  (a) If the wiring is not correct: 
R  - repair the above defective wirings. 
R  (b) If the wiring is correct: 
R  - replace the FIRE Pushbutton Switch (ENG/APU Fire Panel 1WD) 
R  (Ref. AMM TASK 26-12-12-000-003) and (Ref. AMM TASK 26-12-12-
R  400-003)

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R TASK 73-00-00-810-921
R Engine 2 does not stop during shut down sequence with FIRE Pushbutton Switch
R 1. Possible Causes_______________
R - Actuator-LP Fuel Valve (10QG)
R - LP Fuel Valve (13QM)
R - Check Valve (123QM)
R - aircraft wiring
R - FIRE Pushbutton Switch (ENG/APU Fire Panel 1WD)

R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 26-12-12-000-003 R R AMM 26-12-12-400-003 R R AMM 28-16-00-710-002 R R AMM 28-16-42-000-001 R AMM 28-16-42-400-001 R AMM 28-24-41-000-001 R AMM 28-24-41-400-001 R AMM 28-24-51-000-001 R AMM 28-24-51-400-001 R ASM 28-24/00
R 3. Fault Confirmation
__________________
R A. Test Removal of the FIRE Pushbutton Switch (ENG/APU Fire Panel 1WD) Installation of the FIRE Pushbutton Switch (ENG/APU Fire Panel 1WD) Operational Check of Pylon Check Valve to Ensure Valve not Failed Open Removal of the Fuel Recirculation Check-valve Installation of the Fuel Recirculation Check-valve Removal of the LP Fuel Valve 12QM(13QM) Installation of the LP Fuel Valve 12QM(13QM) Removal of the LP Fuel Valve Actuator Installation of the LP Fuel Valve Actuator
R (1) Not applicable, the fault is evident.
R 4. Fault Isolation
_______________
R A. If the fault symptom is identified by the crew observation "ENG 2 -R During ENG shut down sequence with FIRE P/B: ENG DOES NOT STOP"
R - disconnect the connectors AA and BB from Actuator-LP Fuel Valve (10QG)
R and make sure that, when the Fire push button is pushed, there is 28
R VDC at pins C of the connectors AA and BB:

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R  (1) If there is 28VDC: 
R  - replace the Actuator-LP Fuel Valve (10QG) (Ref. AMM TASK 28-24-51-
R  000-001) and (Ref. AMM TASK 28-24-51-400-001) 
R  (a) If the fault continues, replace the LP Fuel Valve (13QM) (Ref. 
R  AMM TASK 28-24-41-000-001) and (Ref. AMM TASK 28-24-41-400-001) 
R  (b) If the fault continues, do an operational check of the Check 
R  Valve (Ref. AMM TASK 28-16-00-710-002): 
R  1_  If the test is correct, no maintenance action is required
R  2_  If the test is not correct, replace the Check Valve (123QM)
R  (Ref. AMM TASK 28-16-42-000-001) and (Ref. AMM TASK 28-16-42-
R  400-001) 
R  (2) If there is no 28VDC: 
R  - do a check of the aircraft wiring between the Actuator-LP Valve and 
R  the ENG Fire panel (1WD) (Ref. ASM 28-24/00). 
R  (a) If the wiring is not correct: 
R  - repair the above defective wirings. 
R  (b) If the wiring is correct: 
R  - replace the FIRE Pushbutton Switch (ENG/APU Fire Panel 1WD) 
R  (Ref. AMM TASK 26-12-12-000-003) and (Ref. AMM TASK 26-12-12-
R  400-003)

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 DISTRIBUTION - FAULT ISOLATION PROCEDURES

_________________________________________
 TASK 73-10-00-810-801
 Failure of the HMU Fuel Metering Valve on Engine 1
 1. Possible Causes
_______________
 - ECU (4000KS)
　
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