Originally Posted by
B2N2
Before sending a student off on a solo I'd pop a door on them both in flight and right after lift off.
Good stuff.
The other one in a 152 (which
is in the book) is a banging noise coming from the underside as you reach lift-off speed, due to having shut the end of the seat belt in the door.
Again, if this happens just after lift off, I would suggest you
leave it alone until cruise or downwind - too many reports of people killing themselves losing control trying to open and shut doors when they're already busy enough with other things.