Document ID: chunk:federal_register_of_legislation:F2005B00777:body:0:p5
Version: federal_register_of_legislation:F2005B00777
Segment Type: other
Provision Reference: 
Character Range: 10234–12854

10 000 feet flight altitude must carry sufficient supplemental oxygen:
 (a)  where the aircraft can safely descend to Flight Level 140 or a lower level within 4 minutes at all points along the planned route and maintain Flight Level 140 or a lower level for the remainder of the flight — to provide 10% of the passengers with supplemental oxygen for 30 minutes or 20% of the passengers with supplemental oxygen for 15 minutes; and
 (b) where the aircraft cannot safely descend to, or maintain, Flight Level 140 or a lower level in accordance with subparagraph (a) — to provide each passenger with supplemental oxygen for so much of the flight time above Flight Level 140 that exceeds 4 minutes duration and to provide 10% of the passengers with supplemental oxygen for 30 minutes or 20% of the passengers with supplemental oxygen for 15 minutes.
8 SUPPLEMENTAL OXYGEN REQUIREMENTS FOR PRESSURISED AIRCRAFT ENGAGED IN FLIGHTS ABOVE FLIGHT LEVEL 250
 Application
8.1 This subsection applies to pressurised aircraft that fly above Flight Level 250.
 Manner of calculating supplemental oxygen supply
8.2 In determining the amount of oxygen required to be carried on a pressurised aircraft for the purposes of paragraphs 8.3, 8.6, and 8.8, an operator is to determine that amount on the basis that:
 (a) a cabin pressurisation failure will occur at a point on the planned flight route which is most critical from the standpoint of oxygen need; and
 (b) after the failure, the aircraft will descend in accordance with the emergency procedures specified in the aircraft's flight manual (without exceeding its normal operating limitations) to a flight altitude or a Flight Level, as the case may be, that will allow the safe termination of the flight.
 Supplemental oxygen for flight crew members
8.3 A flight crew member who is on flight deck duty in a pressurised aircraft to which this subsection applies:
 (a) must be provided with, and must use, supplemental oxygen at all times during which the cabin altitude exceeds 10 000 feet; and
 (b) must be provided with at least:
 (i) in the case of a high capacity aircraft that is to be operated above Flight Level 250 but not above Flight Level 450 — a 45 minute supply of oxygen; or
 (ii) in the case of a high capacity aircraft that is to be operated above Flight Level 450 — a supply of oxygen for the period determined by adding 30 minutes to the aircraft's emergency descent safety period; or
 (iii) in the case of an aircraft, other than a high capacity aircraft, that is to be operated above Flight Level 250 but not above Flight Level 450 — the supply of oxygen set out