TCM Cutback Test Failed

TASK 73-11-00-810-827-A
TCM Cutback Test Failed

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 71-00-00-860-823	Start the Engine (Normal Automatic Start)
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 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

3. Fault Confirmation
Subtask 73-11-00-710-082-A ** ON A/C NOT FOR ALL

A. Not Applicable

NOTE: The Electronic Engine Control (EEC) has detected that the Throttle Control Malfunction (TCM) cutback test has failed in channel A or channel B. The TCM cutback test is completed during an engine autostart. The EEC will command the overspeed shutoff valve closed and then open. The overspeed shutoff valve is integral to the integrated fuel pump and control. The integrated fuel pump and control is mounted on the fuel manifold located at the 3 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).

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 73-11-00-810-076-A ** ON A/C NOT FOR ALL

A. Do as follow:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Do a check of the MCDU for faults related to TCM cutback.
(a) If faults are present, troubleshoot these faults first.
(3) If no faults were found:
(a) Replace INTEGRATED FUEL PUMP AND CONTROL [4360KS] AMM 73-11-01-000-801 and AMM 73-11-01-400-801.
(b) Do the test given in Para. 4.B.

Subtask 73-11-00-710-083-A ** ON A/C NOT FOR ALL

B. Test
(1) Do an engine normal automatic start AMM 71-00-00-860-823 and an engine shutdown AMM 71-00-00-860-814 then check on ground scan report to confirm repair of this fault.
(a) If the fault does not return, you have fixed the problem.

5. Close-up
Subtask 73-11-00-860-076-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 04:36:35 UTC