AIRPLANE
OPERATIONS
MANUAL
OXYGEN
REVISION 26
2-16-10
Page
1
Code
01
FLIGHT CREW OXYGEN
The flight crew is provided with oxygen through a conventional
high-pressure gaseous system. The system employs a 50-cu.ft
cylinder in which the oxygen is stored at high pressure (1850 psi),
installed on the right side of the cockpit/passenger cabin partition, to
feed the cockpit crew masks.
The system is protected from overpressurization by a safety disc
located on the lower right side of the aircraft’s nose. Discharge through
the safety disc may be visually verified when the discharge indicator
(green disc) has been blown out. If the cylinder pressure drops below
400 psi, a caution message is presented on EICAS.
The cylinder is provided with an integrated shutoff/regulator valve, that
controls oxygen outlet pressure. The regulator valve at the ON position
supplies the crew distribution lines at low pressure rate (70 psi). A relief
valve opens if the pressure exceed 90 psi.
The cockpit is provided with a quick-donning diluter/demand-type
mask, available inside mask stowage boxes adjacent to each crew
station, and a smoke protection kit. The smoke protection kit consists
of two smoke goggles to be used with the diluter/demand masks by the
pilot and copilot, and one Protective Breathing Equipment (PBE) unit
for fire fighting.
Two additional PBE units are also available in the passenger cabin to
protect crewmembers or flight attendants from smoke during fire
fighting operation.
An oxygen service panel, located on right side of the front fuselage,
allows access to the oxygen cylinder and monitoring of oxygen quantity
through a pressure gauge. Some airplanes may have a factory
incorporated removable panel located behind the copilot’s seat that
provides access to the oxygen cylinder and its replacement. The
cylinder pressure is also indicated on the MFD (ECS page).
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