Loss of pressure at 30k is deadly. In recent history a mechanic forgot to reset 'oxygen' to 'auto' after some debugging session. The two pilots missed it on their checklist.
While they were climnbing they gradually lost consciousness. One of the non flight crew ended up being the only conscious person on board. When his air ran out, he lost consciousness.
The flight ended when all kerosine was used, by flying into a hillside.
While they were climnbing they gradually lost consciousness. One of the non flight crew ended up being the only conscious person on board. When his air ran out, he lost consciousness.
The flight ended when all kerosine was used, by flying into a hillside.
https://en.m.wikipedia.org/wiki/Helios_Airways_Flight_522