Fault Message:

L FUEL FLOW TRANSMIT/FMU XCK MA

Fault Code:

7326620LBR

Associated CAS:

None

The fault message is set when there is an unsatisfactory difference between these signals:

• The signal which gives an indication of fuel flow from the Fuel Flow Transmitter
• The signal which gives an indication of the position of the Fuel Metering Valve in the Fuel Metering Unit (FMU)

These circuits are continuously monitored by the Full-Authority Digital Engine-Controller (FADEC).

• Fuel Flow Transmitter (FFT)
• Fuel Metering Unit (FMU)
• Left Engine Electronic Control (EEC)

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Remove the electrical power from the aircraft.
2. Perform a deactivation of the thrust reverser.
3. Open the cowls.
4. Perform a check for signs of fuel leaks on the interface between the fuel flow transmitter and the FMU.

   1. If there is a leakage, replace fuel tubes, unions and connectors as required and go to step 7.
   2. If there is no leakage, continue with next step.

5. Replace the fuel flow transmitter.

   1. If system checks are good, go to step 7.
   2. If fault remains, continue with next step.

6. Replace FMU.
7. Close the cowls and perform a activation of the thrust reverser.
8. Do close out.