![]() Helios Flight 522 crashed when the crew unknowingly suffered hypoxia.Īlthough the masks in the passenger cabin deployed, the crew were ![]() I will pull some excerpts from that below. You always have to remember: In high altitudes you become unconscious after less than 30 secs without the mask, and as the masks can only produce a limited amount of oxygen it's a really time critical issue to reach the flight-deck and initiate a descend if the pilots are already out of service!įirst and foremost you should read the accident report which you can find in full here. In my opinion the cabin crew should be trained to know what's normal procedure if masks drop, but I would definitely tell a flight attendant about my concerns if nothing happens after two minutes or so. Either the pilots already suffered hypoxia or they didn't notice the passenger masks drop at all. If neither of those options happens something is definitely wrong. In both cases I would expect an announcement that the oxygen masks are not needed and can be put down safely. ![]() If this doesn't happen it would be possible that the crew deployed the masks manually for no reason or the automatism faulty detected a low cabin pressure. ![]() In this special situation, as you know that the oxygen masks deploy automatically if the cabin altitude raises to high, you expect the aircraft to descend in order to allow the pax to breathe normally again. It's never bad to inform a crew member about anything you think may be abnormal. ![]()
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