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EMERGENCY EQUIPMENT Description Vol. 2 08.10.4
Oct 05/06
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
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NORMAL – A diluted mixture of oxygen and ambient air adjusted for cabin altitude; and
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100% – Pure oxygen (100%) is delivered at a pressure dependent on cabin altitude.
Emergency Flow Control Knob
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NORMAL (unmarked) – Oxygen is regulated on demand;
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EMERGENCY – A constant flow of oxygen is delivered at a positive pressure; and
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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 08.10.5
Oct 05/06
Flight Deck Oxygen Masks
Figure 08.10.2
EMERGENCY EQUIPMENT Description Vol. 2 08.10.6
Oct 05/06
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:
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CLOSED – Stops the oxygen supply to the dropdown masks;
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NORMAL – The dropdown masks deploy when the altimetric valve senses the cabin altitude is greater than 14,500 feet and oxygen is supplied to the masks; and
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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.
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