BDCV Test Abort Count on Both Channels

TASK 73-11-00-810-880-A
BDCV Test Abort Count on Both Channels

1. Possible Causes

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 71-00-00-720-811	Test No. 3 - Idle Power Test

3. Fault Confirmation
Subtask 73-11-00-710-141-A ** ON A/C NOT FOR ALL

A. Not Applicable

NOTE: The Electronic Engine Control (EEC) channel A and B detected there were 50 times that it was not able to determine the Bypass Directional Control Valve (BDCV) moved to the correct position during the automatic test. An automatic test of the BDCV is run during a normal engine start. The BDCV is integral to the integrated fuel pump and control. The integrated fuel pump and control is attached to the fuel manifold located on top of the main gearbox at the 4 o'clock position. This message will be associated with an ECAM alert ENG X MINOR FAULT.

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 73-11-00-810-169-A ** ON A/C NOT FOR ALL

A. Contact Pratt & Whitney and provide CSTT data or decoded SAR data. Make sure that the data includes the following parameters:

GMT
Fuel temperature
Oil temperature
Engine above idle bit
FOCBV position
FOCBV command
Fuel flow
Fuel flow command
Fuel Metering Valve (FMV) position
N1
N2
Throttle Lever Angle (TLA)
Environmental Control System (ECS) bleed bits
Air conditioning pack setting
Master lever setting
Burner pressure
Loop in control
Min N2 (from CMBC)
Min Pb (from CMBC).

(1) Do the test given in Para. 4.B.

Subtask 73-11-00-710-142-A ** ON A/C NOT FOR ALL

B. Do an engine run to idle to confirm repair of this fault AMM 71-00-00-720-811 and look at the last ACMF report.
(1) If the fault does not return, you have fixed the problem.

5. Close-up
Subtask 73-11-00-860-118-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 04:36:36 UTC