In-flight LOP Mag Check (video)

Discussion in 'Flight Following' started by Martin Pauly, Apr 2, 2021.

  1. Martin Pauly

    Martin Pauly Pre-takeoff checklist PoA Supporter

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    Periodically, I see questions on the forums about in-flight lean-of-peak (LOP) mag checks. This video is an attempt to explain what they are, why you want to do one, and how exactly to do that.

     
  2. EdFred

    EdFred Taxi to Parking

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    So what happens (like it did to me on a fail mag) when you do the mag check in flight, and the engine quits? Yes, it can happen with certain mags. Not all stay hot. Resuming the spark with an exhaust full of fuel vapors is not a good recipe.
     
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  3. Rcmutz

    Rcmutz Line Up and Wait

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    What if I can’t fly LOP? My engine is carbureted. Is there still value in doing a leaned mixture in flight mag check? Or should mixture be full rich?
     
  4. Martin Pauly

    Martin Pauly Pre-takeoff checklist PoA Supporter

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    I have to ask, did you watch the video? Half of it addresses exactly that problem, and demonstrates a solution that will avoid combustion in the exhaust.

    - Martin
     
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  5. Martin Pauly

    Martin Pauly Pre-takeoff checklist PoA Supporter

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    I would do the check with the same mixture setting you use in cruise flight then, which I assume is somewhat leaned but still on the rich side of peak. That will still give you a better (earlier) indication of a problem than the typical ground check.

    - Martin
     
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  6. EdFred

    EdFred Taxi to Parking

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    I will admit that I did not watch the video before posting that question.
     
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  7. Stephen Shore

    Stephen Shore Pre-takeoff checklist

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    Great video as usual. I will try this this week while over the airport at altitude. I need to practice steep spirals anyway - been awhile.

    Keep up the good videos Martin!