In commercial passenger aviation, how frequent (or infrequent) is the case that oxygen masks deploy?
Please include links to statistics.
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4$\begingroup$ So infrequently that any statistics, if they exist, will be meaningless. $\endgroup$– SimonCommented Mar 19, 2017 at 15:58
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2$\begingroup$ Not statistically significant, almost no matter how you slice it. Flying Hours/Deployments, Flights/Deployments, Aircraft/Deployments... $\endgroup$– Ron BeyerCommented Mar 19, 2017 at 16:14
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1$\begingroup$ @RalphJ: Opinion, because, in my opinion, there is no mandatory notification for such event. $\endgroup$– minsCommented Mar 19, 2017 at 19:30
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1$\begingroup$ @RalphJ Are you expecting an answer which is not opinion based? Any answer, since there will be no meaningful measures, must be opinion based. I'll kick it off. In my opinion, once every 12.7 million person miles. $\endgroup$– SimonCommented Mar 19, 2017 at 20:01
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3$\begingroup$ I'd be willing to bet serious money that there are far more deployments from hard landings and accidental deployments than from loss of pressurization. I'm embarrassed to admit it, but I made a hard landing in a 727 back in the 1980s that dropped a few masks in the back, and once while flying right-seat in a Citation, the left-seat guy accidentally deployed the masks. Neither I nor, to the best of my knowledge, any of my flying acquaintances ever experienced a loss of pressurization resulting in a deployment. $\endgroup$– TerryCommented Mar 19, 2017 at 21:37
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1 Answer
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Very, very rare, probably in the range of sinlge digits per 100,000 flights (for major first-world airlines, perhaps higher elsewhere).
I'll try to get you a more numeric answer tomorrow.
Posting an answer now so that I can edit it, evem if the question gets closed between now and then.
"Opinion based", horsefeathers!
answered Mar 19, 2017 at 20:56
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$\begingroup$ try to help you: militar: ncbi.nlm.nih.gov/pubmed/15945394 $\endgroup$ Commented Mar 21, 2017 at 19:05
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$\begingroup$ australia: atsb.gov.au/publications/2006/b20060142 and flightsafety.org/wp-content/uploads/2016/12/… (accidents per year) $\endgroup$ Commented Mar 21, 2017 at 19:06
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$\begingroup$ canada: depressurization: bst-tsb.gc.ca/eng/stats/aviation/2012/ss12.asp#sec4 $\endgroup$ Commented Mar 21, 2017 at 19:18
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$\begingroup$ finaly: researching in the NTSB records, 01/01/2011 to 31/12/2016, there were 12 itens for "oxygen masks". $\endgroup$ Commented Mar 21, 2017 at 19:25