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Thread: RPM goes erratic and then to 0

  1. #1

    RPM goes erratic and then to 0

    Today during climb out my RPM display showed big erratic movements and then went to 0 for the rest of the flight. I returned to the field And checked visually the wiring to the sensor in the magneto and it seems fine. Do you have a suggestion what's going on and how to fix it.

    Thanks
    Michael

    AF-4500 deck EFIS and EM
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    Last edited by Michael; 03-19-2014 at 12:42 PM.

  2. #2
    Quote Originally Posted by Michael View Post
    Do you have a suggestion what's going on and how to fix it.
    Check to see if the actual rpm sensor has come out of our machined RPM housing, you can epoxy it back in.
    Rob Hickman
    Advanced Flight Systems Inc.

  3. #3
    Thanks Rob is there anything else I should check. I don't want to loose too much time.

    Mike

  4. #4
    Advanced Flight Systems Shawn McGinnis's Avatar
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    With a volt meter check that you are getting +5 volts between RED and BLK. You can also check that BLK to Airframe is a low ohm reading and RED is high.
    Shawn McGinnis

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

  5. #5
    For everyones benefit I removed the sensor and checked the wiring and it looks as if the red wire insolation was faulty which caused the erratic reading. Now newly insolation and better attached the RPM reading is back to normal.
    Mike

  6. #6
    Mike,
    Thanks for the feedback.

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