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Having flown both in the past, they will both fly fine single engine. Low mp on one engine but the other running fine would still be ok, as long as the mp doesn't drop below about 15" or so(this is a "zero thrust" estimate, it's been many many years since I've flown these types). Having one engine out, but still windmilling, will put you in a world of hurt on both these airplanes. Low mp could mean that an engine had failed(and the mp indication dropped to the ambient pressure), and he failed to recognize that fact and secure the engine. I've experienced this firsthand on the Chieftain when I lost an engine in cruise and took my time troubleshooting and securing it. It would not maintain 7,000ft with the prop windmilling(descending about 500-700fpm), but it would climb with that prop feathered(just myself and very light fuel, ground temps in the mid to upper 80's).flint4xx said:Anybody with any 402 and Navajo experience care to comment on the ability to hold altitude with "low manifold pressure", and only one person on board? This smells bad to me on several levels.