Shut-down magneto check - advice
It seems fairly standard practice at the end of a flight to switch mags off one-at-a-time to check each ignition circuit (i.e. Lycoming).
I've also been advised by several instructors that switching off both together, and back on, checks whether either circuit is live with mags off. Sounds reasonable.
However, our Rotax 912 guru has made it clear that this is seriously dangerous practice on a Rotax, with the risk of shearing propeller bolts.
He also commented it was bad practice on a Lycoming (for example) as it would torque-shock both the crank and prop bolts.
I'd really appreciate hearing your opinions on this.