OXYGEN AND EMERGENCY EQUIPMENT
Volume 2
Flight Crew Operating Manual
Sep 13/2004
08-01-04
CSP 100-6
REV 1
OXYGEN SYSTEM (Cont)
COMPONENTS AND OPERATION
The flight deck oxygen system consists of two stowage containers attached to the crew seats, and two quick-donning type
oxygen masks.
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.
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