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using a continuous-flow system, make sure the outlet assembly and plug-in
coupling are compatible.
• INDICATOR - most oxygen delivery systems
indicate oxygen flow by use of flow indicators.
Flow indicators may be located on the
regulator or within the oxygen delivery tube.
Don the mask and check the flow indicator to
assure a steady flow of oxygen.
• CONNECTIONS - ensure that all connections are secured. This includes
oxygen lines, plug-in coupling, and the mask.
• EMERGENCY - have oxygen equipment in the aircraft ready to use for those
emergencies that call for oxygen (hypoxia, decompression sickness, smoke and
fumes, and rapid decompressions.) This step should include briefing passengers
on the location of oxygen and its proper use.
Training
To get first-hand experience using oxygen equipment, it is highly recommend
that all pilots, especially those operating their aircraft at altitudes where oxygen
is required, get additional training in an altitude chamber. The Federal Aviation
Administration offers several of these valuable training programs through the U.S.
Air Force and Army. If interested, use the contact information at the end of this
brochure.
Be Aware
From a safety-of-flight standpoint, oxygen equipment is an issue that should concern
all pilots. Know the equipment you have on board, know when to use it, and most
importantly, know its limitations. It’s your key to a safe and enjoyable flight.
Federal Aviation Regulations and Oxygen Use
(Title 14 of the Code of Federal Regulations)
Sec. 135.89 Pilot requirements: Use of Oxygen.
(a) Unpressurized aircraft. Each pilot of an unpressurized aircraft shall use oxygen
continuously when flying—
(1) At altitudes above 10,000 feet through 12,000 feet MSL for that part of the flight at
those altitudes that is of more than 30 minutes duration; and
(2) Above 12,000 feet MSL.
(b) Pressurized aircraft. (1) Whenever a pressurized aircraft is operated with the cabin
pressure altitude more than 10,000 feet MSL, each pilot shall comply with paragraph (a) of
this section.
(2) Whenever a pressurized aircraft is operated at altitudes above 25,000 feet through 35,000
feet MSL, unless each pilot has an approved quick-donning type oxygen mask–
(i) At least one pilot at the controls shall wear, secured and sealed, an oxygen mask that
either supplies oxygen at all times or automatically supplies oxygen whenever the cabin
pressure altitude exceeds 12,000 feet MSL; and
(ii) During that flight, each other pilot on flight deck duty shall have an oxygen mask,
connected to an oxygen supply, located so as to allow immediate placing of the mask on the
pilot’s face sealed and secured for use.
(3) Whenever a pressurized aircraft is operated at altitudes above 35,000 feet MSL, at
least one pilot at the controls shall wear, secured and sealed, an oxygen mask required by
paragraph(b)(2)(i) of this section.
(4) If one pilot leaves a pilot duty station of an aircraft when operating at altitudes above
25,000 feet MSL, the remaining pilot at the controls shall put on and use an approved
oxygen mask until the other pilot returns to the pilot duty station of the aircraft.
PART 135
OPERATING REQUIREMENTS:
Commuter and On Demand Operations and Rules
Governing Persons On Board Such Aircraft
§91.211 Supplemental oxygen.
(a) General. No person may operate a civil aircraft of U.S. registry—
1) At cabin pressure altitudes above 12,500 feet (MSL) up to and including 14,000 feet
(MSL) unless the required minimum flight crew is provided with and uses supplemental
oxygen for that part of the flight at those altitudes that is of more than 30 minutes duration;
(2) At cabin pressure altitudes above 14,000 feet (MSL) unless the required minimum flight
crew is provided with and uses supplemental oxygen during the entire flight time at those
altitudes; and
(3) At cabin pressure altitudes above 15,000 feet (MSL) unless each occupant of the aircraft
is provided with supplemental oxygen.
(b) Pressurized cabin aircraft. (1) No person may operate a civil aircraft of U.S. registry with
a pressurized cabin—
(i) At flight altitudes above flight level 250 unless at least a 10-minute supply of
supplemental oxygen, in addition to any oxygen required to satisfy paragraph (a) of this
section, is available for each occupant of the aircraft for use in the event that a descent is
necessitated by loss of cabin pressurization; and
(ii) At flight altitudes above flight level 350 unless one pilot at the controls of the airplane
is wearing and using an oxygen mask that is secured and sealed and that either supplies
　
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