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Old 27th May 2012 | 16:43
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Turbinator_PT6A
 
Joined: May 2010
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From: FL250
Oxygen Mask Limitation
Hello Folks! I had a query regarding the altitude limitation on sustained use of Oxygen masks by crew/pax:

A/C service ceiling : 45000
Crew Mask Limitation for sustained Use : 40000
Pax Mask limitation for sustained use: 25000

Looking for an answer as why is there an altitude limiting factor, so long as there is enough supply form the oxygen cylinders on board.

Thanks.
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