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Magneto Check Procedure

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General Aviation

Why are magnetos checked from both to right to both to left to both instead of both to right to left to both?

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1 Answers

  1. Koehn on Nov 22, 2010

    Actually, you want to go both to left to both to right to both.
    You go back to both in between to verify that the RPMs come back up to normal and to reestablish your baseline. You start with the left mag first so that when you’re done with the right mag you don’t accidentally leave the ignition switch pointing to the right mag instead of both.
    It’s vital that you verify that the tachometer returns to your baseline RPM whenever the switch is set to both, not just that it drops when you turn it to left or right.

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