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A manifold system delivers oxygen to crew oxygen masks. When supplemental oxygen is needed, or when the air contains toxic fumes, each crew member has access to individual quick-donning masks located in a container behind each crew sta-tion. A regulator attached to each oxygen mask provides three selectable supply modes: NORMAL diluted demand, 100% pure oxygen on demand, and EMERGENCY. One portable breathing equipment (PBE) container is located behind the pi-lot’s station on the bulkhead near the floor. OXYGEN CYLINDER The basic oxygen system includes one 77 cu ft (2183 liters) cylinder. A second 115 cu ft (5458 liters) cylinder is available as an option for long distance flight capability. Both cylinders are equipped with the same regulator for supplying reduced pressure to the distribution circuit. Both oxygen cylinders are composite cylinders with a pressure reducing regulator mounted directly on top and manually operated through an on/off toggle. Oxygen is stored in the cylinder at high-pressure. The regulator reduces high-pressure oxygen to a lower suitable pressure for use with passengers, therapeutic and crew masks. The cylinder and regulator assembly is installed inside a dedicated compartment in the lavatory section (right side). The cylinder includes safety relief valves (one on the high-pressure line and another on the reduced pressure line) and are con-nected to discharge lines and to the overboard discharge indicator. A temperature and pressure transducer provides the oxygen compartment ambient temperature and the oxygen pressure in the cylinder(s) to the EPAV. Based on these two signals the EPAV generates a temperature-compensated pressure signal and sends it to the EICAS. According to the number of cylinders installed on aircraft, the EICAS converts the pressure signal into liters of oxygen for display of oxygen quantity in the cockpit. When fully charged, the oxygen system pressure is 1850 psi. The quantity is continuously monitored and displayed on the EICAS and SUMMARY synoptic pages. When the quantity of the cylinder is less than 700 liters the readout changes to amber and the OXYGEN QUANTITY LOW (C) CAS message is displayed. The message is based on temperature corrected pressure. OVERBOARD DISCHARGE INDICATOR The shutoff and pressure regulator system incorporates a pressure relief valve to discharge the oxygen cylinder contents overboard in the event of excessive oxygen pressure. Should the contents be discharged overboard, the green overboard discharge indicator located above the oxygen servicing panel on the right side of the of the aircraft will be ruptured or missing. Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1 08-01-04 OXYGEN SERVICE PANEL The oxygen service panel is located on the right side of the fuselage directly forward of the right engine. The oxygen service panel has a filler valve and a pressure gauge. Replenishment of the oxygen system is a maintenance function. 中国公务机网 www.gongwuji.com 公务机翻译 www.aviation.cn 本文链接地址：庞巴迪挑战者300公务机机组操作手册 Bombardier Challenger-氧气和应急设备(3) |
