HPSOV Mechanically Stuck

TASK 73-11-00-810-819-A
HPSOV Mechanically Stuck

1. Possible Causes

INTEGRATED FUEL PUMP AND CONTROL [4360KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-834-A	General Troubleshooting Guidelines for Additional Troubleshooting Information
TSM TASK 71-00-00-810-835-A	Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 71-00-00-860-814	Shutdown of the Engine
AMM 73-11-01-000-801	Removal of the Integrated Fuel Pump and Control (IFPC)
AMM 73-11-01-400-801	Installation of the Integrated Fuel Pump and Control (IFPC)
AMM 73-21-00-710-807	Test No.6 - EEC Operation Test (Idle Test)
AMM 78-36-00-010-802	Opening of the Thrust Reverser Cowl-Doors
AMM 78-36-00-410-802	Closing of the Thrust Reverser Cowl-Doors
Integrated Fuel Pump and Control Wiring Harnesses

3. Fault Confirmation
Subtask 73-11-00-710-070-A ** ON A/C NOT FOR ALL

A. Not Applicable

NOTE: The Electronic Engine Control (EEC) has detected that HPSOV position feedback indicates the valve is closed when supposed to be open or it is open when supposed to be closed or the overspeed spooldown test has failed. The HPSOV is part of the integrated fuel pump and control (IFPC). The integrated fuel pump and control is mounted on the top of the main gearbox at the 4 o'clock position.

Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).

(1) If the maintenance message is intermittent, do the troubleshooting steps in the component and harness intermittent troubleshooting procedure (Ref. TSM TASK 71-00-00-810-835).
(2) If the maintenance message is a hard fault, go to the Para. Fault Isolation.

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

WARNING: REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.

Subtask 73-11-00-810-068-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Replace INTEGRATED FUEL PUMP AND CONTROL [4360KS] AMM 73-11-01-000-801 and AMM 73-11-01-400-801.
(a) Do the test given in para 4.B.

Subtask 73-11-00-710-071-A ** ON A/C NOT FOR ALL

B. Check if the fault continues:
(1) Do the FADEC system idle test AMM 73-21-00-710-807.
(2) Shutdown the engine AMM 71-00-00-860-814.
(3) Check the MCDU screen to confirm the repair of this fault.
(a) If the engine shuts down properly and the maintenance message does not repeat, the fault has been fixed.

5. Close-up
Subtask 73-11-00-860-068-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:36:34 UTC