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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
7.3 A flight crew member who is on flight deck duty in a pressurised aircraft to
which this subsection applies must:
(a) be provided with at least a 15 minute supply of supplemental oxygen
whenever the aircraft is to be operated above 10 000 feet flight altitude;
and
(b) use supplemental oxygen at all times during which the cabin altitude
exceeds 10 000 feet.
Supplemental oxygen for other crew members
7.4 A crew member (not being a flight crew member on flight deck duty) in a
pressurised aircraft to which this subsection applies must:
(a) be provided with supplemental oxygen at all times during which the cabin
altitude exceeds 10 000 feet; and
(b) use supplemental oxygen at all times during which the cabin pressure
altitude exceeds Flight Level 140.
Supplemental oxygen for passengers
7.5 A pressurised aircraft to which this subsection applies that is to be operated
above 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:
Issue 6: 8 December 2004
Amdt No. 206
SECTION 20.4 -6-
Issue 6
(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 in paragraph 8.3.1; or
(iv) in the case of an aircraft, other than a high capacity aircraft, that is to
be operated above Flight Level 450 — a supply of oxygen for the
aircraft’s emergency descent safety period.
8.3.1 For the purposes of sub-subparagraph 8.3 (b) (iii), the supply of oxygen that
must be provided in an aircraft is:
(a) if the aircraft’s flight manual sets out the time specified by its
manufacturer as the time required for it to descend from its maximum
operating altitude to 10, 000 feet:
(i) a supply for the aircraft’s emergency descent safety period; or
(ii) a 10 minute supply;
whichever is more; or
(b) in any other case — a 15 minute supply.
8.4 Unless paragraph 8.5 applies, where a pressurised aircraft to which this
subsection applies is operated above Flight Level 250, then at least 1 pilot
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