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Old 17th Mar 2016, 08:30
  #103 (permalink)  
Wingswinger
 
Join Date: Aug 2003
Location: Hampshire physically; Perthshire and Pembrokeshire mentally.
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My recollection from RAF days:

O2 required above 10,000ft; 100% O2 required above 25,000ft; Under pressure above 33,000ft.

Up to 41,000ft unpressurised for the duration of a 180 turn? If the anoxia doesn't get them, the cold will.
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