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RH EMERGENCY
PRESSURIZATION
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COCKPIT AVIONICS
COOLING FAN
Pilot’s Manual
PM-126A 6-21
OXYGEN SYSTEM
The aircraft oxygen system provides oxygen service for the crew and
passengers. The system consists of the crew and passenger distribution
systems, and a high-pressure oxygen storage system. Electrical power
to operate the passenger oxygen system is supplied by the EMER BATT
bus through a 2-amp PAX OXY circuit breaker located on the pilot’s circuit
breaker panel (ENVIRONMENTAL group).
Oxygen is available to the crew at all times and can be made available
to the passengers either automatically above 14,500 (±250) feet cabin altitude,
or manually at all altitudes through the use of the DEPLOY
switch located on the copilot’s PAX OXYGEN panel. The oxygen system
is designed for use during emergency descent to a cabin altitude
not requiring oxygen, and is not to be used for extended periods of
flight at cabin altitudes requiring oxygen (Refer to oxygen duration
chart, Section IV of the AFM) or as a substitute for the normal pressurization
system. An optional altitude compensating regulator is available
for extended oxygen duration. Smoking is prohibited when
oxygen is in use.
OXYGEN STORAGE AND PRESSURE REGULATION
The high-pressure oxygen storage system consists of a storage cylinder,
a shutoff valve and regulating assembly, a direct reading pressure
gauge and service valve attached to the regulator, an overpressure
burst disk and indicator, a combined pressure/temperature transducer
for EICAS display, and a solenoid operated passenger oxygen valve
with an integral system pressure switch. On aircraft modified by SB 45-
12-1 (Installation of Remote Oxygen Servicing Provisions), a remote service
valve and gauge are installed allowing service through the nose access
door.
The oxygen storage cylinder has a minimum storage capacity of 645 liters
of oxygen at 70° F (21° C) when charged to 1850 psi. The cylinder
is located in the nose compartment, or may be installed in the lavatory
within a left closeout. The shutoff and pressure regulator assembly
form an integral part of the storage cylinder and provide for pressure
regulation, pressure/temperature indication, and servicing.
Oxygen pressure for the passenger and crew distribution systems is
regulated to a pressure of 60 to 80 psi. The shutoff and pressure regulator
assembly also incorporates a burst disc pressure relief valve to discharge
the oxygen cylinder contents overboard in the event that
cylinder pressure reaches 2500 to 2775 psi. Should the cylinder contents
be discharged overboard, the green overboard discharge indicator on
the outside surface of the aircraft near the storage cylinder will be ruptured
or missing, and the EICAS pressure display will illuminate amber
dashes.
Pilot’s Manual
6-22 PM-126A
The oxygen pressure gauge is located near the service port. The pressure/
temperature transducer will provide pressure and temperature
signals to the EICAS. On aircraft modified by SB 45-12-1, this transducer
also provides information to the oxygen servicing pressure gauge. Temperature
and pressure signals are input to the temperature compensated
pressure warning system in EICAS to alert the crew of low or high
oxygen quantity.
A pressure switch, integral with the oxygen control valve, will provide
a signal to EICAS indicating when the regulator is off. The system pressure
distribution line is vented when the regulator is in the OFF position,
thus preventing trapped pressure in the line from giving an
erroneous indication that oxygen is available.
The following CAS illuminations are specific to oxygen pressure:
OXYGEN SYSTEM COCKPIT CONTROLS
The oxygen system cockpit controls consist of two switches located on
the copilot’s PAX OXYGEN panel. The PAX OXY /AUTO switch automatically
controls oxygen availability to the passenger oxygen distribution
system. The DEPLOY switch provides manual activation.
Oxygen is available to the crew oxygen distribution system at all times
when the oxygen cylinder shutoff valve is open. Control positions and
system functions are as follows:
1.With the PAX OXY/AUTO switch On (OFF not illuminated),
oxygen is available to the passenger distribution system and the
passenger masks will deploy automatically in the event cabin
altitude climbs to 14,500 feet. Should the cabin altitude reach
14,500 (±250) feet, an electrical signal from the pressurization
indicator will cause the solenoid valve (integral with the passenger
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