[marioair]

Of interest, pretty well all of the mag failures I've ever had had occurred in the air - between the Performance Check and landing. And were only picked up on the final drop/no-stop check. So it isn't one to skimp on.

The only mag failure that I remember well would have been found just before shutdown, but was instead found (well, suspected,) the hard way in a c150 in the climb out, only a few minutes after the pilot I was checking out said on base leg that he was really enjoying himself and could we do one more circuit so a t&g rather than a full stop landing?

Would a faulty switch (not earthing) increase chances of engine failure? Why?

[riverrock83]

No. Irv was only pointing out unfortunate timings when deciding to do a touch & go.

[Irv Lee]

Exactly, given the choice of taxiing a c150 to parking on one mag, or climbing out (as in another circuit) on one mag, I would definitely advise the taxiing