engine 5

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  • Kentucky, United States
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  • The easiest thing to do would be to just hang a new one and cycle the APU on/off switch. The spline is keyed, so it can't be installed incorrectly.
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  • Mark created a new forum post in ATA 28 Fuel Systems
    APU fuel valve warning on EICAS and fault light on overhead with APU off.





    This warning is shown when the commanded position of the fuel shutoff valve does not match the actual valve position. There would be similar warnings for the APU Fuel Isolation Valve also.

    The valve is located in the left forward wing root.



    9.9 times out of 10...... the valve is going to be the faulty component, but just to make sure I checked for coil voltage at relay K192 and jumped the relay control wires at the actuator plug.




    No voltage at relay and the jumper caused the fault to clear...... obvious bad valve (either the internal switch was failed or the valve was not actually moving. In this case, the valve was stuck open.)

    Valve removed.




    Two drawings of system indication. A explanation of internal actuator switch functions can be found here.



    767-300 SSM 28-25-01
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  • Mark created a new forum post in ATA 24 Electrical Power
    I recently worked on a 767-300 that was not closing the DC Bus Tie Relay when one of the T/R's failed.

    The system uses a DC Tie Control Unit that senses a lack of 28VDC on either the left or right DC bus. The unit will wait 12 seconds before closing the tie relay.

    The control unit is located on the P6 panel (forward section).




    A simple test after replacement is to pull a T/R breaker and monitor the DC EICAS screen to verify both sides still have power.




    A simple depiction of the system.

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