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REV 1
OXYGEN AND EMERGENCY EQUIPMENT
Volume 2 Flight Crew Operating Manual Sep 13/2004
08-01-02 CSP 100-6 REV 1
OXYGEN SYSTEM
DESCRIPTION
Oxygen is stored in gaseous form in one or two cylinders, and delivers oxygen at a reduced pressure to the electrical pneumatic
actuating valve (EPAV). The EPAV supplies oxygen to the crew masks, passenger drop out boxes and therapeutic
mask. It optimizes the passenger oxygen consumption and gives system information to the EICAS.
OXYGEN SYSTEM — BASELINE CONFIGURATION
OXYGEN PIPELINE
ELECTRICAL SIGNAL LINE
ELECTRICAL POWER LINE
PNEUMATIC SIGNAL LINE
CFO0801002_002
OVERBOARD
DISCHARGE
INDICATOR
FILLER
VALVE
PRESSURE
GAUGE
L MAIN
TO EICAS
PRESSURE &
TEMPERATURE
TRANSDUCER
TO THERAPEUTIC CIRCUIT
TO PAX MASKS DROP OUT BOXES CIRCUIT
QUICK
DISCONNECTS
CREW MASKS
IN STOWAGE
CUPS
AUDIO
LINES
OXYGEN
CYLINDER
77 CU FT
TEST PORT
CREW
ELECTRICAL
ELECTRICAL
SUPPLY LP
CONF.
SWITCH
PAX
E.P.A.V.
FIRST AID
OFF DEPLOY
ON
THERAPEUTIC
OXYGEN PAX
AUTO
OXYGEN
MAN DEP/IND
R ESS BUS
SMOKE
GOGGLES
OXYGEN
AUTO DEP/
THERAPTC
OXYGEN AND EMERGENCY EQUIPMENT
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 08-01-03
OXYGEN SYSTEM (Cont)
OXYGEN SYSTEM — OPTIONAL CONFIGURATION
OXYGEN PIPELINE
ELECTRICAL SIGNAL LINE
ELECTRICAL POWER LINE
PNEUMATIC SIGNAL LINE
CFO0801002_014
OVERBOARD
DISCHARGE
INDICATOR
FILLER
VALVE
PRESSURE
GAUGE
TEST PORT
CREW
ELECTRICAL
ELECTRICAL
SUPPLY LP
CONF.
SWITCH
PAX
E.P.A.V.
FIRST AID
L MAIN
TO EICAS
PRESSURE &
TEMPERATURE
TRANSDUCER
TO THERAPEUTIC CIRCUIT
TO PAX MASKS DROP OUT BOXES CIRCUIT
QUICK
DISCONNECTS
CREW MASKS
IN STOWAGE
CUPS
AUDIO
LINES
OFF DEPLOY
ON
THERAPEUTIC
OXYGEN
R ESS BUS
OXYGEN
CYLINDER
77 CU FT
OXYGEN
CYLINDER
115 CU FT
GOGGLES
OXYGEN
MAN DEP/IND
OXYGEN
AUTO DEP/
THERAPTC
PAX
AUTO
SMOKE
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 station.
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 pilot’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 connected
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
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