(3)
The left door of the stowage box has a reset/test control slide. The slide is pressed in the direction of the arrow to reset the oxygen supply valve when the left door is closed. It is also pressed in the direction of the arrow to do a test of the oxygen supply without removing the mask from the stowage box.
(4)
The oxygen supply valve in the stowage box is a sliding piston valve. The reset/test control slide, on the left door, will keep the piston in the closed position. When the left door is opened the piston moves to the open position. This will permit oxygen to flow through the supply valve and make the OXY ON flag show. Closing the doors and pressing the reset/test control slide in the direction of the arrow closes the supply valve.
(5)
An oxygen flow indicator is an integral part of the supply valve. The indicator blinks when there is an oxygen flow.
(6)
A pressure switch is an integral part of the supply valve. When the supply valve is open and oxygen flows, the oxygen pressure will close the pressure switch. With the pressure switch closed, the microphone installed in the mask will be switched on.
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Stowage Box
Figure 002
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Supply Valve - Stowage Box
Figure 003
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(7)
Flexible hoses are used to connect the distribution pipe to the supply valve and the supply valve to the oxygen mask. A microphone lead is attached to the flexible hose that is connected to the supply valve and the oxygen mask.
(8)
For the 4th occupant, the mask installed is identical to the other masks. The audio communication is not possible because the stowage box assembly is not connected to the audio circuit of the aircraft.
E. Full-Face Quick-Donning Mask
(Ref. Fig. 004)
(1)
A flight crew member can put on the full-face quick-donning mask in less than 5s. The mask has an inflatable harness, a face piece, a demand regulator, and a microphone.
(2)
The mask is kept in the stowage box with the harness deflated. When the mask is removed from the box, the red right side of the grip has to be pressed to inflate the harness. A valve opens in the mask and permits the oxygen supply pressure to inflate the harness. When the mask has been put on, the grip is released and the oxygen pressure is released. The harness will then deflate and pull the mask face piece tightly onto the user's face. (Ref. Fig. 005)
(3)
The mask face piece is full face and gives protection to the user's eyes, nose and mouth. It will be pulled tightly onto the face when the harness deflates. The face piece has been designed to permit the user to keep glasses on. The mask is equipped with a plastic window. In order to protect this window during normal operation (pulling out of its stowage box,
R maintenance) an upper protective film (optional) is installed on the R face mask window. This film protects the window against scratches to R the higher part.
This film is made of soft plastic (with electrostatic adhesive) and can be removed easily by the user by means of its side strip.
(4) The demand regulator has two controls and three supply functions. The controls are a Normal/100 % selector and an emergency overpressure knob. The three supply functions are as follows: (Ref. Fig. 006)
(a) An air/oxygen supply is given with the Normal/100 % selector in the Normal position. Above 10600 m (34777.54 ft.), an aneroid capsule in the demand regulator automatically closes the air inlet to give a 100 % oxygen supply.
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Full-Face Quick-Donning Mask
Figure 004
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Inflatable Harness Operation
Figure 005
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Demand Regulator - Air/Oxygen Supply
Figure 006
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R (b) A 100 % oxygen supply is given with the Normal/100 % selector in
R the 100 % position. The selector locks in the 100 % position when
R selected.
R (Ref. Fig. 007)
R (c) A 100 % oxygen supply with overpressure is given with the
R Normal/100 % selector in the 100 % position and the emergency
R overpressure knob in the overpressure position. When the
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