However generally speaking, once the issue has been identified the plane should start a decent if possible. There are any number of things that could cause a depressurization and some may also cause flight control issues as we saw Aloha Airlines Flight 243 a situation where the crew did not immediately know what was going on. There are some assumptions here of course first and foremost that the plane is still maneuverable. I would expect the plane to immediately descend to a lower Masks deployed, I know that there is only about 10 minutes oxygenĪvailable. If I was a passenger on a plane at cruise altitude and the oxygen The aircraft manufacturer’s documentation for maintenance and flight Organizational issues related to safety oversight of maintenance andįlight operations by Cyprus DCA, EASA/JAA and ICAO issues related to Pertaining to: maintenance procedures pilot training, normal andĮmergency procedures organizational issues of the Operator the report also identifies a number of additional safety deficiencies The report would cite bad procedures for this This is a procedural failure on the implementation end. Omission of returning the cabin pressurization mode selector to theĪUTO position after non-scheduled maintenance on the aircraft that the following factors could have contributed to the accident: One can conclude from the report that its possible the pilots assumed the cabin pressure system was in the proper place (auto) when in fact it was set to manual (MAN) and subsequently were confused by the alarm or thought it was faulty. Generally speaking "Don Oxygen Masks" is the first item on the emergency checklist following the mishap of the South Dakota LearJet crash in 1999. Many might say they did in fact know there was a problem but for some unknown reason they did nothing about it. Of the warnings ( Cabin Altitude Warning Horn, Passenger Oxygen Masks Non-identification of the warnings and the reasons for the activation The crew would have been alerted by alarms to the depressurization event This is the one of the debated/interesting aspects of the accident. Unaware of this and didn't realize the extent of the problem. 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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