***Link*** :: [§ 91.211 Supplemental oxygen.](https://www.ecfr.gov/current/title-14/section-91.211) ***Description*** :: `= this.link` ***Author*** :: [[FAA]] #### Key Quotes * Unpressurized Cabins * \>12,500-14kft and >30 minutes at that level: Flight Crew requires oxygen * \>14kft: Flight Crew requires oxygen * \>15kft: Passengers must be offered oxygen * Pressurized Cabins * \>FL250: 10 minute supply available for each passenger * \>FL350: One pilot wears mask, or two pilots each have quick-donning mask * \>FL410: One pilot wears mask #source #far