Some time back I was trying to check out an instructor on a Cessna 421, powered by "GITSO" engines, on the way to the run up pad I sugested he do a "dead mag" check, to my horror, and to the great distress of the gear box ,he shut of BOTH mags and then turned them back on, never did finish checking him out, and the gear box needed changing ten hours later, his career as a corporate pilot {not in my aircraft} lasted four trips before he bent a twin rather badly, so now he is back teaching students how to wreck engines, and all the other nonsense procedures which have crept into flight training on this side of the pond.{such as endless checklists in single fixed gear, fixed pitch trainers}