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  • A cannula is an ergonomic piece of plastic tubing which runs under the nose and is often used to administer oxygen in non-pressurized aircraft.
  • Cannulas are typically more comfortable then masks and can be used up to 18,000 feet.
  •  Altitudes greater than 18,000 feet require the use of an oxygen mask.
  •  Many cannulas have a fl ow meter in the line.
  •  If equipped, a periodic check of the green fl ow detector should be part of a pilot’s regular scan.

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