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Thread: AFS4500 problem - VOR OBS keeps resetting to 000 (linked to GNC255)

  1. #1

    AFS4500 problem - VOR OBS keeps resetting to 000 (linked to GNC255)

    Hi there

    When a VOR is tuned in, every time I change the OBS radial using the CRS selector on the AFS, it stays on new CRS for about 3 seconds, then defaults back to 000 every time.

    Anyone else experienced this and know what the issue could be?

    Thanks

  2. #2
    Senior Member
    Join Date
    Mar 2010
    Location
    gilford, nh
    Posts
    334
    sounds like a setting issue on either the gnc255 or 4500
    I would call tech support from sitting in the airplane
    Alan

  3. #3
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Location
    Canby, OR
    Posts
    861
    That sounds like a broken EFIS TX -> GNC255 RX wire. The EFIS is trying to set the value but the 255 isn't hearing the command.
    Shawn McGinnis

    Advanced Flight Systems
    support@advanced-flight-systems.com

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