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Outfitted Systems, of this manual.
Airplanes SN 1290 and subsequent have both the crew and passenger oxygen
systems installed. Both types of configurations are discussed in this description.
The crew oxygen system is a pressure-demand type system, while the passenger
oxygen system is a continuous flow type system. When in use, they provide an
emergency oxygen source to the flight crew, jump seat observer and cabin
passengers. The following units and components compose the system:
• Oxygen Cylinder and Regulator Assembly
• Oxygen Servicing Panel
• Oxygen System Control Panel
• Passenger Oxygen Control Panel
• Crew Mask/Regulator Assembly
All GIV oxygen systems use only aviator’s breathing oxygen conforming to
MIL-O-27210. Use of medical oxygen is strictly forbidden due to its high
moisture content. This moisture could freeze in the supply lines, rendering
the system inoperative.
2. Description of Subsystems, Units, and Components:
A. Oxygen Cylinder and Regulator Assembly:
(1) Airplanes SN 1000 through 1289:
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-35-00
Page 1
May 30/02
Revision 7
(See Figure 1.)
The crew oxygen cylinder is constructed of a seamless aluminum
liner with a filament overwrap of Kevlar. It has a gaseous capacity of
50 cubic feet (1,416 liters) and is normally pressurized to 1800 psi at
70° F (21° C). The observed pressure reading when fully serviced
varies with temperature, however, and may fall in a range between
1,485 psi at 0° F (-18° C) to 2015 psi at 120° F (49° C). The crew
oxygen cylinder is installed underneath the forward cabin floor, in
the area approximately between the second set of cabin windows.
A regulator assembly is attached to the neck of the cylinder. The
primary function of the regulator is to reduce high cylinder pressure
to a nominal delivery pressure of approximately 70 psi. A manual
ON/OFF knob is installed on the regulator to allow or inhibit oxygen
flow directly from the cylinder. The knob is accessible from the cabin
through an access panel cut into the floorboard.
In addition to controlling oxygen supply and its delivery pressure, the
regulator assembly provides ports for the following connections:
(a) Oxygen Cylinder Direct Reading Gauge:
A direct reading gauge is installed on each regulator
assembly in order to obtain oxygen cylinder pressure directly
from the cylinder.
(b) Supply Line:
A supply line exiting the cylinder pressure regulator routes
oxygen to the crew oxygen system control panel where flow
can be controlled by the panel’s ON/OFF toggle switch.
When the toggle switch is selected ON, flow is routed to the
three crew mask/regulator assemblies. A check valve is
installed on the supply line to prevent system backflow.
A pressure switch is installed between the cylinder pressure
regulator and check valve to monitor supply line pressure. If
the switch senses a line pressure below approximately 50
psi, a discrete is sent to Data Acquisition Unit (DAU) #1. DAU
#1 in turn causes the Crew Alerting System (CAS) to display
an amber CREW OXYGEN OFF caution message. The
purpose of this message is to caution the flight crew that the
oxygen cylinder may have been manually shut off at the
cylinder.
(c) Fill Line:
A fill line is installed to transfer oxygen from an external
source connected to the oxygen servicing panel (left forward
nose section) to the oxygen cylinder.
(d) Gauge Line:
A dedicated gauge line is installed to allow viewing of cylinder
pressure. Leaving the regulator assembly, the gauge line
connects to the direct reading gauges on the oxygen
servicing panel (left forward nose section) and the crew
oxygen system control panel (pilot’s skirt panel). Flow
restrictors are incorporated so that should a gauge line
rupture, the resulting oxygen loss rate would be limited to
OPERATING MANUAL
2A-35-00 PRODUCTION AIRCRAFT SYSTEMS
Page 2
May 30/02
Revision 7
approximately one liter per minute.
(e) Overboard Discharge Line:
An overboard discharge line is installed to vent oxygen
overboard through a port located on the left fuselage, forward
of the wing leading edge. The cylinder regulator will allow
overboard discharge under the following conditions:
• Regulated oxygen pressure exceeds 90 psi, activating
the regulator’s relief valve
• Oxygen cylinder pressure exceeds 2775 psi, rupturing
the regulator’s high pressure burst disk
• Oxygen temperature exceeds 225 (±5)° F, melting the
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湾流4操作手册 Gulfstream IV Operating Manual 2(128)
