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Old 24th Apr 2012, 22:49
  #19 (permalink)  
SFI145
 
Join Date: Apr 2002
Location: Bohol, Philippines
Posts: 150
I think another important factor is that many biz-jets are operated as private flights where the pilot oxygen requirements are less stringent. Whereas for example under Part 135 one pilot must be wearing an oxygen mask at all times above FL350.
If one pilot leaves the flight deck above FL250 the other pilot must be using the mask.

http://www.faa.gov/pilots/safety/pil..._Equipment.pdf
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