Fault Message:

L VSV SYSTEM TRACK FAULT

Fault Code:

7326015LBR

Associated CAS:

L FADEC FAULT
(Advisory)

Full-Authority Digital Engine-Controller (FADEC) does not move the Variable Stator Vane Actuator (VSVA) to the necessary position. The flight crew will possibly know the effect of unsatisfactory Engine operation such as Engine surge.

• Left Engine Electronic Controller (EEC)
• Buffer Air Valve (BAV)
• Left Variable Stator Vane Actuator (VSVA)
• Fuel Metering Unit (FMU)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

WARNING: OBEY ALL FUEL SAFETY PRECAUTIONS WHEN YOU DO WORK ON THE FUEL SYSTEM AND FUEL SYSTEM COMPONENTS. IF YOU DO NOT OBEY THE SAFETY PRECAUTIONS, YOU CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

1. Check for the fault message is stored, the fault could be intermittent. Monitor the system to see if the fault message occurs again.

   1. If the fault message is active, proceed as follows to measure the torque that is necessary to move the VSV system.
   2. If the fault message is not active, continue with next step.

2. Open the following circuit breakers:

   System	Circuit Breaker Name	Bus Name
   ENGINE	L FADEC CH A	BATT
   ENGINE	L FADEC CH B	BATT
   ENGINE	L ENG IGN 1	BATT
   ENGINE	L ENG IGN 2	BATT
   ENGINE	L ENG FUEL HPSOV	BATT
   ENGINE	L ENG START A	BATT
   ENGINE	L ENG START B	BATT
   ENGINE	L T/R CTL VALVE	BATT
   ENGINE	L T/R LOWER LOCK	BATT
   ENGINE	L T/R UPPER LOCK	BATT

3. Deactivate the Thrust Reverser and open the cowls.
4. Remove the applicable bypass-duct access panel and the applicable compressor fairing.
5. Drain the fuel from the VSVA as follows:

   • Put the clean container in position to catch the fuel that drains from the FMU
   • Remove the inhibit plug from the FMU and let the fuel drain
     NOTE: This releases the hydraulic lock and lets the VSVA be moved.
   • Remove and discard the packing from the inhibit plug
   • Remove the container

6. Measure the maximum torque that is necessary to move the VSV system by Installing the traverse tool to the bell-crank of the VSV mechanism.
7. Use the torque wrench with the traverse tool to move the VSV system through 10 cycles. Record the maximum torque necessary to move the VSV system.

   1. If the VSV system moves freely through 10 cycles and the recorded torque is 135.60 lbf ft (183.85 Nm) or more, go to step 13.
   2. If the VSV system moves freely through 10 cycles and the recorded torque is less than 135.60 lbf ft (183.85 Nm), replace the FMU and continue with next step.

8. Remove the traverse tool from the bell-crank of the VSV mechanism.
9. Install the inhibit plug in the FMU as follows:

   • Install a new packing on the inhibit plug
   • Torque the inhibit plug to between 73.00 and 87.00 lbf in (8.24 and 9.83 Nm)

10. Install the applicable compressor fairing and the applicable bypass-duct access panel.
11. Close the cowls and perform the activation of the thrust reverser.
12. Close the following circuit breakers:

    System	Circuit Breaker Name	Bus Name
    ENGINE	L FADEC CH A	BATT
    ENGINE	L FADEC CH B	BATT
    ENGINE	L ENG IGN 1	BATT
    ENGINE	L ENG IGN 2	BATT
    ENGINE	L ENG FUEL HPSOV	BATT
    ENGINE	L ENG START A	BATT
    ENGINE	L ENG START B	BATT
    ENGINE	L T/R CTL VALVE	BATT
    ENGINE	L T/R LOWER LOCK	BATT
    ENGINE	L T/R UPPER LOCK	BATT

    1. If the fault message stays active, replace the left EEC and go to step 25.
    2. If the fault message is not active, go to step 25.

13. Turn the VSV system until the ram of the VSVA is fully retracted.
14. Disconnect the ram of the VSVA from the VSV link and pull the link clear of the ram.
15. Use the torque wrench with the traverse tool to move the VSV system through 10 cycles. Record the maximum torque necessary to move the VSV system.

    1. If the VSV system moves freely through 10 cycles and the recorded torque is less than 135.60 lbf ft (183.85 Nm), replace the VSVA and go to step 25.
    2. If the VSV system does not move freely through 10 cycles and the recorded torque is 135.60 lbf ft (183.85 Nm) or more, continue with next step.

16. Connect the VSV link to the ram of the VSVA.
17. Disconnect the VSV link to the buffer air valve.
18. Make sure that the buffer air valve moves freely.

    1. If the buffer air valve moves freely, connect the VSV link.
    2. If the buffer air valve does not move freely, replace the buffer air valve and connect the VSV link.

19. Examine the cranks and links of the VSV mechanism for signs of damage.

    1. If damage is not found, remove the traverse tool from the bell-crank of the VSV mechanism and go to step 25.
    2. If damage is found, refer to BRR and continue with next step.

20. Remove the traverse tool from the bell-crank of the VSV mechanism.
21. Install a new packing on the inhibit plug and install the inhibit plug in the FMU.
22. Torque the inhibit plug to between 73.00 and 87.00 lbf in (8.24 and 9.83 Nm).
23. Perform an engine-run leak check.
24. Install the applicable compressor fairing and the applicable bypass-duct access panel.
25. Close the cowls and perform the activation of the thrust reverser.
26. Close the following circuit breakers:

    System	Circuit Breaker Name	Bus Name
    ENGINE	L FADEC CH A	BATT
    ENGINE	L FADEC CH B	BATT
    ENGINE	L ENG IGN 1	BATT
    ENGINE	L ENG IGN 2	BATT
    ENGINE	L ENG FUEL HPSOV	BATT
    ENGINE	L ENG START A	BATT
    ENGINE	L ENG START B	BATT
    ENGINE	L T/R CTL VALVE	BATT
    ENGINE	L T/R LOWER LOCK	BATT
    ENGINE	L T/R UPPER LOCK	BATT

    1. If the fault message stays inactive, do close out.
    2. If the fault message stays active, continue with next step.

27. Replace power plant.
28. Connect the electrical power to the aircraft.
29. Make sure that L (R) FADEC FAIL (Caution) does not show on the EICAS display.
30. Do close out.