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(2) Airplanes SN 1290 and Subsequent:
The crew and passenger oxygen control panel is located on the
pilot’s forward instrument panel. It contains both crew and
passenger pressure gauges, each displaying oxygen system
pressure on the respective oxygen gauge line. The control panel
also contains two ON/OFF toggle valve switches, each controlling
oxygen flow to the respective oxygen systems. Lighting for the
control panel is supplied by the cockpit lighting system.
D. Passenger Oxygen Control Panel (All GIV Aircraft):
(See Figure 7.)
The passenger oxygen control panel, located on the copilot’s right console
panel, controls and annunciates oxygen flow and displays system pressure
to the passenger oxygen masks. (The type, quantity and location of
passenger masks is selected by the aircraft owner and installed during
aircraft outfitting.) Lighting for the control panel is supplied by the cockpit
lighting system. The passenger oxygen control panel has the following
components:
(1) OFF / AUTO / MAN Knob:
The OFF / AUTO / MAN knob controls the oxygen flow to the
passenger oxygen masks. In the OFF position, oxygen flow to the
passenger oxygen masks is inhibited. The AUTO position allows the
passenger oxygen control panel to deploy (drop) the passenger
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oxygen masks automatically when sensed cabin altitude reaches
13,000 ±500 feet. Oxygen flow to the passenger oxygen masks is
then regulated based on cabin altitude. Manual selection to the MAN
position deploys the passenger oxygen masks and provides a
constant preset flow.
(2) PASS OXYGEN ON Annunciator:
When oxygen flow through the passenger oxygen control panel is
sensed, a pressure switch inside the passenger oxygen control
panel closes, causing a discrete to be sent to DAU #1. DAU #1 in
turn causes the CAS to display an amber CABIN OXYGEN ON
caution message. The pressure switch also causes the PASS
OXYGEN ON annunciator to illuminate amber.
(3) OXYGEN SUPPLY PRESSURE Gauge:
The OXYGEN SUPPLY PRESSURE gauge displays oxygen system
pressure available to the passenger oxygen masks.
(4) ALT TEST Port:
The ALT TEST port is used by maintenance personnel to check the
automatic operation of the passenger oxygen control panel.
(5) Passenger Oxygen TEST Button (Airplanes 1457 and Subs):
Currently, there are production provisions for a PASS OXY test
button on the TEST panel (copilot side of center console).
The passenger oxygen system is normally operated by first ensuring the
OFF / AUTO / MAN knob is set to OFF on the passenger oxygen control
panel. Next, passenger oxygen is selected ON at the oxygen system
control panel. (This sequence ensures the passenger oxygen masks do not
inadvertently deploy.) After passenger oxygen is selected ON, the OFF /
AUTO / MAN knob is then set to AUTO. In this configuration, the passenger
oxygen control panel will deploy the passenger oxygen masks
automatically when sensed cabin altitude reaches 13,000 ±500 feet.
When the passenger oxygen masks are deployed, an amber CABIN
OXYGEN ON will be displayed on CAS, along with the associated aural
caution tone. In addition, the NO SMOKING signs in the cabin and lavatory
areas will illuminate and the cabin chime will sound momentarily.
E. Crew Mask/Regulator Assembly (All GIV Aircraft):
(Descriptions and illustrations in this section are limited to the EROS MXP
300 crew mask/regulator. For further details on the EROS MXP 100 and
MXP 300 crew mask/regulators, refer to EROS Operating and
Maintenance Instructions, EROS document number 4NUT0045A, dated
October 15, 1999 or later approved version. See Figure 8.)
The mask/regulators are normally kept in stowage compartments located
on the pilot’s side console, copilot’s side console and left hand radio rack.
The mask is removed from the stowage compartment by grasping the
regulator with three fingers (middle, ring and small), while keeping the
thumb and forefinger open, and withdrawing the mask. When the mask/
regulator is removed from the stowage compartment, the open doors
activate a shutoff valve, making oxygen available to the mask. The blinker
will display a yellow cross when oxygen is flowing.
In order to prevent inflating the mask harness before it is withdrawn from
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Revision 7
the stowage compartment, the inflation valve (red ears) is not depressed
until after the mask is out of the stowage compartment. The inflation valve
　
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