@mountainriver Also of note: the Helios Airways Flight 522 disaster. (Loaded 737 crashed, everybody killed … because of a locked cockpit door: plane depressurized and pilots’ oxygen failed, cabin crew—inc. a pilot—were unable to gain cockpit access in time to save the plane before it ran out of fuel and crashed.) https://en.wikipedia.org/wiki/Helios_Airways_Flight_522
because of a locked cockpit door
Door wasn’t locked and had nothing to do with the crash. In fact a flight attendant managed to get into the cockpit and turn the plane from a populated part of Athens, likely saving lives shortly before it fully crashed
The plane simply never pressurized and literally as the co-pilot realized what was happening hypoxia took them and the captain, all because a switch could turn pressurization into a manual override and there was no warning before takeoff that it was that way
