DA 42 accident

That big gear at the back of the engine that drives the mags is a single
point of failure. While it is a very robust object, it's still driving
both mags.

There are a few significant differences between this SPOF and the DA42
electrical SPOF. That big gear is =part= of the engine (in the same
sense that the mags are part of the engine), and it does not drive
anything else. Were that gear to also drive (say) the air conditioner,
then the air conditioner could put unwanted stress on the gear and
possibly break it. This is what (I gather) could happen with the
DA-42's design, where the electrical bus in question is not =dedicated=
to the engine.

Jose
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