91.209 Use of oxygen equipment

• (a) A pilot-in-command of an unpressurised aircraft must, during any time that the aircraft is being operated above 13 000 feet AMSL and during any period of more than 30 minutes that the aircraft is being operated between 10 000 feet and up to and including 13 000 feet AMSL, require--
  • (1) each crew member and each passenger to use supplemental oxygen; and
  • (2) each crew member to use portable oxygen equipment, including a regulator and attached oxygen mask, for any duty requiring movement from their usual station.
• (b) A pilot-in-command of a pressurised aircraft must--
  • (1) during any time the cabin pressure altitude is above 10 000 feet AMSL, require--
    • (i) each crew member to use supplemental oxygen; and
    • (ii) each crew member to use portable oxygen equipment, including a regulator and attached oxygen mask, for any duty requiring movement from their usual station; and
  • (2) during any time the aircraft is being operated from flight level 350 up to and including flight level 410, require--
    • (i) one pilot at a pilot station to wear and use an oxygen mask that either supplies supplemental oxygen at all times or automatically supplies supplemental oxygen whenever the cabin pressure altitude exceeds 13 000 feet AMSL; or
    • (ii) two pilots to be at their pilot stations and each pilot to have access to an oxygen mask that can be placed on the face and supplying oxygen within 5 seconds; and
  • (3) during any time the aircraft is being operated above flight level 410, require one pilot at a pilot station to wear and use a demand oxygen mask at all times.
• (c) A pilot-in-command of a pressurised aircraft must, following pressurisation failure, require each passenger to use supplemental oxygen during any time that the cabin pressure is above 14 000 feet AMSL, unless the aircraft can descend to 14 000 feet AMSL or below within 4 minutes.