gismo
Touchdown! Greaser!
Bonanza - must be locked during flight. There are two very large emergency egress windows right behind the B pillar.
Even with a Bonanza, it depends. With a large door that has a rotating handle to operate the latch, there's no way it can come open accidentally and it provides a good emergency exit. If the plane is equipped with one or two third row seats, it's the best way out. My Baron has such a door and I never lock it in flight any more than I'd lock the main cabin door. Finally, on the early straight tailed Bonanzas (Debonairs), the center windows don't open so the baggage door is the only way out if the door won't open.
Personally, I'd leave any door unlocked if it's usable as an emergency exit unless an inflight opening would be dangerous or the latch wasn't secure when unlocked. Baggage doors like mine that are hinged on the leading edge could hardly cause a problem if they opened in flight and they are going to be held nearly closed by the airstream preventing the loss of anything much bigger than a piece of paper, but one hinged from the trailing edge and some that pivot on the top edge could be ripped off and cause significant damage if they came open in the air. For that type I'd want to make it as secure as possible.
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