Title: Describe oxygen requirements.
Course: Aircraft Pilot Training I (20053-I) > Section: Understanding Aircraft Systems: Pressurization System

Description should include

- unpressurized aircraft—each pilot of an unpressurized aircraft shall use oxygen continuously when flying
  - at altitudes above 10,000 feet through 12,000 feet mean sea level (MSL) for that part of the flight at those altitudes that is of more than 30 minutes duration
  - above 12,000 feet MSL.
- pressurized aircraft—pilots shall use oxygen
  - when a pressurized aircraft is operated with the cabin pressure altitude more than 10,000 feet MSL
  - when 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
  - whenever the cabin pressure altitude exceeds 12,000 feet MSL, at least one pilot at the controls shall wear a secured and sealed oxygen mask that either continually or automatically supplies oxygen.
- reference to 14 CFR § 91.211, Supplemental Oxygen.

PLT438

Process/Skill Questions:

- Why are oxygen requirements so important?