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Thread: Rotating Beacon

  1. #1

    Rotating Beacon

    I noticed my rotating beacon was inop yesterday. Logs show the original
    Grimes unit was replaced with a Whelan Flashing Beacon per STC SA-615 EA in
    Sept of 1987. I loosened the collar and lifted off the lens (split red and
    white) to see the "lamp element". It's a small tube twisted into an upside
    down U and anchored into a base. Standing on a 2-foot step ladder, I
    couldn't see much else, but the element didn't appear to be easily
    replaceable. I hope I'm wrong.



    Any advice on getting the strobe/beacon functioning again would be greatly
    appreciated.

    Thanks.

    -Rick





    [Non-text portions of this message have been removed]



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  2. #2

    Rotating Beacon

    >I noticed my rotating beacon was inop yesterday. Logs show the original
    >Grimes unit was replaced with a Whelan Flashing Beacon per STC SA-615 EA
    >in Sept of 1987. I loosened the collar and lifted off the lens (split red and
    >white) to see the "lamp element". It's a small tube twisted into an upside
    >down U and anchored into a base. Standing on a 2-foot step ladder, I
    >couldn't see much else, but the element didn't appear to be easily
    >replaceable. I hope I'm wrong.

    That is a Strobe tube, not an incandescent light bulb. Yes it IS
    replaceable (including the base), but you need to know that your power
    supply is not bad, first. There are a couple different Whelen models. One
    has the power supply in the base of the "rotating beacon" and the other has
    a remote power supply that it attached via a gray shielded cable. The
    remote power supply would be in the tail cone.

    See if you can't remove the beacon assembly by taking the screws out at the
    base. If you lift it up and there are only a power and ground wire, then
    you need to have the ASSEMBLY tested and repaired (send it back to
    Whelen). If there is a gray cable with a flat 3 pin connector, you could
    test the bulb by swapping a known good one in and test running it. Any
    Whelen or AeroFlash wing or tail strobe tube would be pin compatible and
    work for the test. Grimes strobes have a different wiring sequence in the
    connector, and will NOT work as a direct replacement.

    Bob Steward, A&P IA
    Birmingham, AL



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