20.4 and 20.6 -
Supplemental oxygen for passengers
8.8 A pressurised aircraft that is to be operated above Flight Level 250 must carry an amount of supplemental oxygen that is sufficient:
(a) to provide:
(i) 10% of the passengers with oxygen during all periods when the cabin altitude is above 10 000 feet and up to and including Flight Level 140; and
(ii) each passenger with oxygen during all periods when the cabin pressure altitude exceeds Flight Level 140; or
(b) to provide each passenger with a 10 minute supply of oxygen;
whichever amount is the greater.