Mag Problems
So what was the problem with the mag Adam !!!
I have had a mag switch break down on a single that made the mag run rough,and also the rotor arm fail on a radial that caused spurious sparks going to the wrong cylinder thereby setting up a massive misfire which felt like an actual component breaking.
The safest mag problem is the one when the points fail to operate properly on the inpulse mag and the engine will not start, therefore preventing a flight.
I had an interesting conversation with a 'mag overhaul' man once who told me that mags from 'tow planes' would quite often not get to TBO without extra attention due to the extra(electrical) load on the components.
Once the jets really got going on the North Atlantic the FE thought it was Christmas every day after years of engine changes and shut downs on the piston variety.