Document ID: chunk:federal_register_of_legislation:F2007C00850:body:0:p4
Version: federal_register_of_legislation:F2007C00850
Segment Type: other
Provision Reference: 
Character Range: 7834–10523

40 000 feet, a mean tracheal oxygen partial pressure of 83.8mm Hg when breathing 30 litres per minute, BTPS, and with a tidal volume of 1100 cc with a constant time interval between respirations.  The flow rates and mask efficiencies specified in Appendix II may be used at cabin pressure altitudes up to 25 000 feet instead of the above flow rates.
       6.3.1For passengers and cabin attendants using nasal cannulas manufactured under the name "Oxymizer", the minimum flow of supplemental oxygen available for each person at various cabin pressure altitudes must not be less than 0.3 litre per minute at 10 000 feet altitude, increasing by 0.1 litre per minute for every 2 000 feet up to 18 000 feet altitude.
       6.4If first-aid oxygen equipment is installed, the minimum mass flow of oxygen available to each user must not be less than 4 litres per minute, STPD.  However, there may be a means to decrease this flow to not less than 2 litres per minute, STPD, at any cabin altitude.  The quantity of oxygen required may be based upon an average flow rate of 3 litres per minute per person for whom first‑aid oxygen is required.
       6.5If portable oxygen equipment is installed for use by crew members, the minimum mass flow of supplemental oxygen must be as specified in paragraph 6.1 or 6.2 of this section, whichever is applicable.

7 Protective breathing equipment
       7.1Protective breathing equipment must be designed to protect the flight crew from smoke or toxic fumes and gases.
       7.2Equipment must include:
(a) masks either covering the eyes, nose, and mouth or covering the nose and mouth with accessory equipment to cover the eyes; and
(b) at least 1 portable oxygen system of the demand type.
       7.3The protective breathing equipment while in use, must allow the flight crew to use the radio equipment and to communicate with each other, while at their assigned duty stations.
       7.4The part of the protective breathing equipment protecting the eyes must not cause any appreciable adverse effect on vision and must allow corrective glasses to be worn.
       7.5The protective breathing equipment must supply protective oxygen of 15 minutes duration per crew member at a pressure altitude 0 feet with a respiratory minute volume of 30 litres per minute, BTPD.  If a demand oxygen system is used, a supply of 300 litres of free oxygen at 20C and 760 mm Hg pressure is considered to be of 15 minute duration at the prescribed altitude and minute volume.  If a continuous flow protective breathing system is used (including a mask with a standard rebreather bag) a flow rate of 60 litres per minute at 8 000 feet (45 litres per minute at sea level) and