In theory if you can start the engine(s) you can fly it is true but in reality, what you don’t know can kill you .
As Sky Steve posted a high performance - complex endorsement is a FAA requirement not a suggestion.
Retractable gear, constant speed prop and 200 hp engines require knowledge and skill to keep you safe. Small piston twins without counter rotating props can be (are ) deadly if mishandled in an engine out sittuation. AS airplane move up in complexity they require the pilot to have a greater knowledge of
systems and procedures .
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