(Just as respectfully) Are you sure that doesn't depend on who the two pilots are?Are you sure you want to act as PIC while someone is brushing up on their rusty skills (asking respectfully)?
Yes, I think a private pilot who passed his checkride last week and never flew from the right seat would be a complete idiot to have a friend practice rusty skills from the "normal" pilot position.
But what if it's an ATP (who never got his CFI) who retired from the airlines a few years ago with 30,000 hours, 5,000 of which were in his own single-engine plane, from both seats?
And what about the infinite variations between those two extremes?
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