Jim Macklin wrote:
On a single-engine, a door opening is not serious, but a
twin with a door open and the engine on the opposite side
might get interesting. The open door would probably raise
Vmca because of the air flow disruption on the side where
maximum rudder effectiveness would be required.


Depends on the aircraft and the door. I believe there
is a crash report of a nose baggage door on a twin opening
and making the plane uncontrollable.