Troubleshoot the Engine after an Engine Performance Decreased event

TASK 71-00-00-810-869-A
Troubleshoot the Engine after an Engine Performance Decreased event

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 73-31-00-810-811-A	Mass Flow Meter Electrical Failure Channel A
TSM TASK 73-31-00-810-812-A	Mass Flow Meter and Fuel Metering Valve Signal Disagreement
TSM TASK 73-32-00-810-803-A	FMV TFUEL Sensor Electrical Failure Channel A
TSM TASK 73-32-00-810-804-A	FMV TFUEL Sensor Electrical Failure Channel B
TSM TASK 75-24-00-810-823-A	ACC Valve Mechanically Stuck Closed - Track Check
TSM TASK 75-24-00-810-826-A	ACC Valve Mechanically Stuck Open - Track Check
AMM 36-11-00-740-803	Bite Test of the BMC
AMM 71-00-00-710-805	Test No. 4 - Power Acceleration/Deceleration Test
AMM 72-00-00-100-802	Cleaning of the Engine Gaspath
AMM 72-00-00-210-813	General Visual Inspection (GVI) of the Engine Inlet Area
AMM 72-31-00-290-802	Borescope Inspection of the Low Pressure Compressor (LPC) Assembly
AMM 72-35-00-290-801	Borescope Inspection of the High Pressure Compressor (HPC) Assembly
AMM 73-21-00-710-806	Test No.7 - EEC Operation Test (Self Test)
AMM 73-21-00-710-809	Test No.15 - Operation Test (Dry Motor) of the FADEC System Engine Actuators
AMM 75-00-00-210-802	Visual Examination of the Engine Air Systems
AMM 75-32-01-200-801	Mechanical Check of the Low Pressure Compressor (LPC) (2.5) Bleed Air System

3. Fault Confirmation
Subtask 71-00-00-710-125-A ** ON A/C NOT FOR ALL

A. Investigate the Engine after an Engine Performance Decreased event
(1) Using the Multipurpose Control and Display Unit (MCDU) test the FADEC system for any recorded faults AMM 73-21-00-710-806.
(2) Any EEC monitored faults are transmitted to the aircraft Centralized Fault Display Interface Unit (CFDIU). The MCDU allows interactive dialog with the EEC. Use the MCDU to review the previous flight leg fault information, scheduled maintenance fault information and ground fault information. If there are any faults reported troubleshoot them first.

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.

Subtask 71-00-00-810-133-A ** ON A/C NOT FOR ALL

A. Do the steps that follow:
(1) If the maintenance messages related to the Active Clearance Control (ACC) valve failure open appear with the ECAM warning for engine FADEC status maintenance and/or the ECAM warning for engine FADEC system fault, refer to ACC valve mechanically stuck open - track check (Ref. TSM TASK 75-24-00-810-826).
(2) If the maintenance messages related to the ACC valve failure close appear with the engine FADEC status maintenance and/or ECAM warning for engine turbine cooling fault, refer to ACC valve mechanically stuck closed - track check (Ref. TSM TASK 75-24-00-810-823).
(3) If the maintenance messages related to the fuel flow meter electrical failure on channel A appear with the ECAM warning for engine minor fault, refer to mass flow meter electrical failure channel A (Ref. TSM TASK 73-31-00-810-811).
(4) If the maintenance messages related to the fuel flow meter and Fuel Metering Valve (FMV) signal disagreement appear with the ECAM warning for engine minor fault, refer to mass flow meter and fuel metering valve signal disagreement (Ref. TSM TASK 73-31-00-810-812).
(5) If the maintenance messages related to the fuel temperature sensor electrical failure on channel A appear with the ECAM warning for engine FADEC status maintenance and/or the ECAM warning for engine heat system fault, refer to FMV TFUEL sensor electrical failure channel A (Ref. TSM TASK 73-32-00-810-803).
(6) If the maintenance messages related to the fuel temperature sensor electrical failure on channel B appear with the ECAM warning for engine FADEC status maintenance and/or the ECAM warning for engine heat system fault, refer to FMV TFUEL sensor electrical failure channel B (Ref. TSM TASK 73-32-00-810-804).
(7) If there are no EEC monitored faults or messages recorded, visually inspect the engine inlet area AMM 72-00-00-210-813.
(8) If there is evidence of contamination, clean the engine gaspath AMM 72-00-00-100-802.
(9) If you find evidence of Foreign Object Damage (FOD), borescope inspect the High Pressure Compressor (HPC) AMM 72-35-00-290-801.
(10) If no evidence of FOD is found, borescope inspect the Low Pressure Compressor (LPC) AMM 72-31-00-290-802.
(11) If you do not find any problems, do a visual inspection the fan duct area AMM 72-00-00-210-813. Look carefully at the fan ducts for missing seals missing or deformed panels and for damaged Fan Exit Guide Vane (FEGV's).
(12) If you do not find any problemes, do a visual inspection of LPC 2.5 bleed system AMM 75-32-01-200-801. Look carefully for evidence of binding in the actuation system or torn/missing 2.5 bleed seals.
(13) If you do not find any problems, do a visual inspection of the engine air systems for indications of hot gas leakage AMM 75-00-00-210-802. Look carefully at the Environmental Control System (ECS) ducts, the anti-ice ducts and the Turbine Cooling Air (TCA) tubes.
(14) If you do not find any problems, do a functional check of the Turbine Case Cooling (TCC) air valve AMM 73-21-00-710-809.
(15) If you do not find any problems, check aircraft ECS for any recorded faults AMM 36-11-00-740-803.
(16) If you do not find any problems, do an engine run (if you have not done one) and a power assurance test AMM 71-00-00-710-805.
(17) Using the Onboard Maintenance System (OMS), test the FADEC system for any recorded faults AMM 73-21-00-710-806.
(18) If the engine performance is not acceptable, remove the engine from service.

5. Close-up
Subtask 71-00-00-860-080-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.

[Rev.8 from Aug 2018] 2026.04.04 04:40:53 UTC