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Single-Bottle System
A green frangible disk located below and aft of the ground servicing panel will fragment to
indicate the relief valve has activated due to an overpressure. The relief valve will activate
when the HP module pressure exceeds approximately 2,600 psi or when the LP module
pressure exceeds 130 psi.
Dual-Bottle System
In dual-bottle systems, there are two green frangible disks located below and aft of the ground
servicing panel to indicate that the relief valve has activated. One disk will rupture if the HP
module pressure exceeds approximately 2,800 psi. The other disk will rupture if the LP module
pressure exceeds 90 psi.
In all cases, an amber OXY LO PRESS message will be displayed on the EICAS when the
oxygen pressure falls below 800 psi.
EMERGENCY EQUIPMENT
Description
Vol. 2 08−10−2
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
OXYGEN SYSTEM (CONT'D)
Oxygen System Panel
Figure 08−10−1
Flight Compartment
Oxygen for the flight crew is provided through a diluter demand regulating system. A
quick-donning, inflatable-harness mask is installed in a container at each side console.
Each container has a test lever, a yellow flow (eye) indicator, oxygen ON flag, a set of
quick-release doors, and connections for the oxygen and communications lines.
EMERGENCY EQUIPMENT
Description
Vol. 2 08−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
OXYGEN SYSTEM (CONT'D)
Pressing the RESET/TEST switch can test oxygen flow through the regulator. The flow indicator
(blinker) displays a yellow cross when oxygen is flowing. The flow indicator is black when there
is no flow. When the mask is in use, a white ON flag comes into view on the left door of the
container to indicate that the oxygen shutoff valve is open. When the mask is no longer
required, closing the container doors and pressing the RESET/TEST switch stops the flow of
oxygen to the mask and removes the white ON flag.
The crew oxygen masks have controls located on the mask. The controls have the following
selections:
Normal/100% Lever
• NORMAL – A diluted mixture of oxygen and ambient air adjusted for cabin altitude
• 100% – Pure oxygen (100%) is delivered at a pressure dependent on cabin altitude
Emergency Flow Control Knob
• NORMAL (unmarked) – Oxygen is regulated on demand
• EMERGENCY – A constant flow of oxygen is delivered at a positive pressure
• PRESS TO TEST (momentary) – Purges the mask of smoke or noxious fumes
Microphone Control
Each mask has a microphone installed, which can be activated on the audio control panel by
selecting MASK/BOOM MIC switch to MASK.
Inflatable Harness Control
The flight deck masks are designed to be removed from their containers and donned with one
hand. This is accomplished by squeezing the red tabs on either side of the oxygen line to
inflate the harness, while pulling the mask from the container. The inflated harness is placed
over the head, and the mask is positioned over the nose and mouth. Releasing the red tabs
deflates the harness, pulling the mask snugly against the face.
NOTE
The harness is not designed to be donned over headsets or
eyeglasses. These should be removed prior to using the mask.
EMERGENCY EQUIPMENT
Description
Vol. 2 08−10−4
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
OXYGEN SYSTEM (CONT'D)
Flight Deck Oxygen Masks
Figure 08−10−2
EMERGENCY EQUIPMENT
Description
Vol. 2 08−10−5
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
OXYGEN SYSTEM (CONT'D)
Quick−Donning Oxygen Mask Settings
Figure 08−10−3
Passenger Oxygen
The dropdown masks are controlled by the PASSENGER OXYGEN control panel which is
located on the copilot’s side console. There are three modes of operation:
• CLOSED – Stops the oxygen supply to the dropdown masks
• NORMAL – The dropdown masks deploy when the altimetric valve senses the cabin
altitude is greater than 10,500 feet or 14,500 feet (aircraft S/N dependent) and oxygen
is supplied to the masks
• OVERRIDE – The dropdown masks deploy and oxygen is supplied to the masks
In the event the dropdown masks do not deploy, the door on the mask box can be opened by
inserting a long, thin object into the release hole.
EMERGENCY EQUIPMENT
Description
Vol. 2 08−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
　
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