§23.2320 Occupant physical environment

(a) The applicant must design the aeroplane to: (1) allow clear communication between the flight crew and passengers; (2) protect the pilot against serious injury due to hazards originating from high energy, associated with systems and equipment; and (3) protect the occupants from serious injury due to breakage of windshields, windows, and canopies. (b) For Level-4 aeroplanes, each windshield and its supporting structure directly in front of the pilot must withstand, without penetration, the impact equivalent to a two-pound bird when the velocity of the aeroplane is equal to the aeroplane’s maximum approach flap speed. (c) The aeroplane must provide each occupant with air at a breathable pressure, free of hazardous concentrations of gases, vapours and smoke during normal operations and likely failures. (d) If a pressurisation system is installed in the aeroplane, it must be designed to protect against: (1) decompression to an unsafe level; and (2) excessive differential pressure. (e) If an oxygen system is installed in the aeroplane, it must: (1) effectively provide oxygen to each user to prevent the effects of hypoxia; and (2) be free from hazards in itself, in its method of operation, and its effect upon other components.