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Thread: Problem with DG

  1. #1

    Join Date
    Feb 2012
    Posts
    14

    Problem with DG


    I have a vacuum driven DG in my 57 Apache. I have vacuum pumps on each engine. Recently, my DG has been intermittment. My IA says he has never heard of an intermittment DG - they work or they don't. He said to double check to ensure it is uncaged. I did and it is. But on the last 4 (VFR) flights, it worked, it didn't, it worked, and then it didn't. I am hesitant to file IFR (actually delayed trips) until I am confident that it will work.

    Anyone experienced this? Any clues to start trouble shooting?

  2. #2

    Join Date
    Sep 2011
    Posts
    288
    Is the DG grinding? What does it sound like at shut down? Especialy when it gets to the end of winding down?

  3. #3

    Join Date
    Feb 2012
    Posts
    14
    I do not recall any abnormal sounds when it is working (Can't hear much in an Apache). It seems to spin down normally when it's working. I don't think it spins up when it doesn't work - I will pay more attention next time.

  4. #4

    Join Date
    Sep 2011
    Posts
    288
    After engine shut down, Listen to the gyro all the way to the end of it's spool down. Hear what it sounds like. Is it abrupt, grind, smooth, ? I had a aviation scrap yard at one time and it doesn't take long for a gyro to go bad. We had a rig to spool them up so the bearings wouldn't go bad and to listen to for noise before we shipped them out so they wouldn't come back. Any grinding and we sold it as a core.

  5. #5

    Join Date
    Sep 2011
    Posts
    96
    rv8505, just curious where you can sell a gyro core? thanks, turbo
    Ed DArcy 'Turbo'
    R-44 N7511G 1,000 hrs / RV-6 N26ED 4,200 hrs / gyro N46ED 50 hrs
    Stuart, FL Hartford,Ct Virgin Gorda, BVI

  6. #6

    Join Date
    Feb 2012
    Posts
    14
    Thanks. I will have some time tomorrow to check it out.

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