Hi GuysI had my passenger endorsement test done today. On late finals my instructor reached out and shut off both mags at around 1800 rpm, to check if I can bring it home safely. All went well until I decided to go up again after passing my endorsement rating. During the pre-take off run up and mag checks, as soon as I switched off the left mag on the Jab with engine running at 1800 rpm, the engine quit. Believing it to be some form of oversight on my part I repeated the checks and the engine quit again as soon as I switched off my left mag. I then decided to restart the engine using both mags as usual and end the flight.
My question is - Is it possible that if someone switched off both mags simultaneously with the engine running at 1800 rpm in mid flight, this could result in any form of damage to the magnetos or the engine?
Thanks again for your input.
Not sure if the RPM setting and cutout at the higher RPM could cause the damage but I am aware of a similar issue being experienced on checking the mags on shutdown after a navex flight. The fault was in one of the distributors where the rivets holding the drive had sheared. The failure was due to the use of rivets that were not recommended for this purpose.
Mag Checks
in Aircraft Incidents and Accidents
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