Originally Posted by
MichaelOLearyGenius
Happened to an air India cores 737. Captain went for a leak, on his return the FO turned the heading knob instead disarming the cockpit door. The captain remained locked out of the flight deck and the aircraft went into a continuous bank and eventual spiral dive and ended up inverted. The plane was recovered by the FO and landed safely but must have been terrifying for crew and pax. Just from memory so don’t quote me 100%.
That sounds like a very confused amalgam of several historical accidents.
If it happened as described, Air India did a very good job of keeping it quiet, given that you don't roll an airliner inverted without injuring passengers and/or crew.