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18th November 2005 | 14:11

#5 (permalink)

Chilli Monster

Joined: Oct 1999

Posts: 2,212

Likes: 0

From: Anywhere

Quote:

apparently when the aircraft is unpressurised it is illegal for flightcrew to fly above FL100 without supplemental oxygen altogether...

Unless you're flying an 'N' on an FAA licence, where the lower limit for supplemental oxygen is 12,500ft amsl.