engine 5

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  • Joined 5 years ago
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  • Kentucky, United States
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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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  • Mark replied to the topic Thanks??? in Aircraft
    Didn't need a Rhino jack for these.

    Now...... that was a different story on a 727 that blew three out of four. One let go and I was dashing with a golf cart to get a jack. By the time I started to drive back to the aircraft..... the left wing was a lot closer to the ground than the right. Sucked.
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  • The GPU doesn't have to be making power for there to be continuity on E & F of the plug. The image above was on a non-running GPU.

    You've got me thinking though. Why does a GPU throw a E&F code when it's not pushed in all the way?

    I'm going to have to put a voltmeter on those fuses on a externally powered aircraft. I'm kinda thinking I'm going to find 28VDC on one.
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