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allowed to cold soak below this temperature, it may be necessary to warm the cabin prior to testing the masks during the
preflight inspection.
NORMAL
When the control knob is in the normal (N) position, the oxygen supplied to the mask is a mixture of ambient air and pressurized
oxygen. In this position, the operator can turn the flow control knob to adjust the flow.
100%
When the control knob is in the 100% position, the mask is provided with pure oxygen.
EMERGENCY
The emergency flow control knob is also located on the regulator unit. If the knob is turned clockwise to the EMERGENCY
position, the mask supplies a constant flow of oxygen at a permanent positive pressure. At high cabin altitude (above 35 000
ft) the mask supplies only pure oxygen at a constant flow, regardless of the knob position.
PRESS TO TEST
When the press to test button is pushed, oxygen is momentarily supplied to the mask and the hose flow indicator will change
color.
INFLATABLE HARNESS CONTROL
The oxygen mask is extracted from the stowage box by gripping the plates of the regulator, which protrude out of the box.
When the two red tabs on the mask are squeezed, the harness inflation valve will open permitting the harness to inflate.
When the tabs are released, the harness deflates and the mask holds tightly against the operator’s face.
CFO0801002_015
CREW OXYGEN MASK
SMOKE GOGGLES
CONTROL KNOB
REGULATOR
REV 1
OXYGEN AND EMERGENCY EQUIPMENT
Volume 2 Flight Crew Operating Manual Sep 13/2004
08-01-08 CSP 100-6 REV 1
OXYGEN SYSTEM (Cont)
MICROPHONE CONTROL
When the O2 MASK/NORM switch on the associated audio control panel is selected to O2 MASK, the microphone in the
mask is activated.
CFO0801002_016
MASK
INFLATABLE
HARNESS
VENT
LEVER
OXYGEN
LINE
HARNESS MANUAL
INFLATION CONTROL
OXYGEN AND EMERGENCY EQUIPMENT
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 08-01-09
PASSENGER OXYGEN SYSTEM
DESCRIPTION
The passenger and crew oxygen systems are supplied by the same oxygen cylinder(s) during cabin depressurization.The
passenger masks will automatically deploy, however, they can be manually deployed from the flight deck at any time by
selecting DEPLOY on the PAX switch on the OXYGEN control panel.
COMPONENTS AND OPERATION
ELECTRICAL PNEUMATIC ACTUATING VALVE (EPAV)
The electrical pneumatic actuating valve (EPAV) controls oxygen availability to the passenger oxygen distribution system
and provides for automatic or manual mode selection. The control is a three-position PAX switch on the OXYGEN panel
labeled OFF, PAX AUTO, and DEPLOY.
When the passenger masks are deployed (automatically or manually), a PAX OXYGEN ON CAS (S) message appears. If
a failure of the passenger oxygen valve is detected, a PAX OXYGEN AUTO FAIL(C) CAS message appears.
AUTOMATIC DEPLOYMENT
With the switch selected to AUTO, the passenger oxygen masks automatically deploy if the cabin altitude climbs to 14,500
ft ± 500 ft. Flow continues until cabin altitude drops below 9500 ft ± 500 ft.
MANUAL DEPLOYMENT
Setting the oxygen switch to the DEPLOY position manually opens the passenger oxygen valve and allows oxygen pressure
to flow to the passenger masks. This position will deploy the passenger masks at any cabin altitude.
With the switch indicator in the OFF position, oxygen is not available to the passenger distribution system regardless of
cabin altitude.
THERAPUTIC OXYGEN
Therapeutic low pressure oxygen is available to the passenger cabin. The outlet is located approximately midway in the
cabin on the right side. Therapeutic oxygen is controlled by the THERAPUTIC switch located on the OXYGEN panel.
MASK CONTAINERS
Each mask container consists of a door, two masks, and a latch mechanism. Containers are installed above each pair of
passenger seats. There is also a mask container in the lavatory located on the bulkhead.
The latch mechanism can be operated manually or electrically. When the latch mechanism is released, the door opens and
the masks drop down.
OFF DEPLOY
ON
THERAPEUTIC
OXYGEN
CFO0801002_004
PAX
AUTO
OXYGEN AND EMERGENCY EQUIPMENT
Volume 2 Flight Crew Operating Manual May 06/2005
08-01-10 CSP 100-6 REV 2
PASSENGER OXYGEN SYSTEM (Cont)
PASSENGER MASKS
The passenger oxygen masks consist of a soft silicone rubber face piece with a reservoir air bag. The reservoir bag incorporates
a green chamber which inflates when oxygen flows to the mask.
When the oxygen masks drop, passengers should don masks and pull the mask lanyard to initiate oxygen flow. The masks
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