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Old 12th Mar 2014, 06:26
  #2062 (permalink)  
nick murry
 
Join Date: Aug 2003
Location: Australia
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Yes you can depress manually. About half an hour in a 772 at FL350 until O2 depletion Give or take. That's by memory as they have removed the figures from our manuals now .

No you must make a manual rapid decent.
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