If the maximum operating pressure of the oxygen system is exceeded the:
Passenger oxygen masks will drop down (the answer i gave)
Wrong because on the vast majority of airliners, pax O2 is generated via chemical cylinders (above the seats) which are activated by pulling the masks down. The pax masks are usually lowered in 1 of 2 ways.
1/ Manually activated by the crew via an electrical switch
or
2/ Automatically activated when cabin pressure drops below a certain level (usually around 10'000 pressure alt)
Oxygen is discharged overboard via a safety plug. (bristol right answer)
This is the correct answer. Although it isn't really very clear (good 'ol JAR ATPL question bank
), it is talking about the crew oxygen which gets topped up by maintenance every so often. If they put to much in, there is a safety plug which blows and releases the O2 overboard. There is a way of inspecting this preflight on most types (usually a green disk).
MP
