Originally Posted by
Flight Alloy
Nope, 787 uses O2 bottles both for flight deck and cabin oxygen systems. Each 3 seat group shares one oxygen bottle in the bulkhead overhead, fired by a pyrotechnic valve when operated. These valves, by definition single use, can not be tested, and are the source of failures.
Presumably a number of bottles from each batch are destructively tested to confirm - at least statistically - that they work?