oxygen requirements (pressurized)

Question 1

above FL250
pressurized cabins

Answer 1

an addition of at least 10 minutes of supplemental o2 for each OCCUPANT

Question 2

above FL350
pressurized cabins

Answer 2

one pilot at the controls must WEAR & USE an o2 mask

*unless 2 pilots are at the control with quick-donning masks & the aircraft is AT OR BELOW FL410

Question 3

if one pilot leaves the controls above FL350

Answer 3

the other pilot must WEAR & USE the o2 mask REGARDLESS if it’s quick-donning type