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Thread: Flying above FL 410
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Old 6th October 2008 | 00:40
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Milt
 
Joined: Oct 2003
Posts: 1,300
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From: Canberra Australia
Isn't FL420 the unpressurised height at which breathing pure oxygen is likely to be inadequate to retain consciousness.? Hense pressure breathing masks emerged to provide for an extra height capability over FL350.
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