| http://www.w3.org/ns/prov#value | - flight at those altitudes that is of more than 30 minutes duration; and (ii) Above 15,000 feet MSL, oxygen to each occupant of the aircraft, other than the pilots, for one hour unless, at all times during flight above that altitude, the aircraft can safely descend to 15,000 feet MSL within four minutes, in which case only a 30-minute supply is required. (c) The equipment required by this section m
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