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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CYLINDER

CYLINDER  CYLINDER CONNECTIONS

CYLINDER COUPLING ASSEMBLY
(WITH INTEGRAL THERMAL COMPENSATOR)

Crew Oxygen Cylinder Assembly
Figure 2

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A 737-300/400/500MAINTENANCE MANUAL
 5.  System Shutoff Valve
____________________
 A.  The system shutoff valve for the crew oxygen system is a manually operated, slow opening valve that controls the supply of oxygen to the mask storage boxes and mask/regulators. The valve has a valve body, inlet and outlet ports, a control handle, and a mounting flange that contains four holes for attachment. The valve is operated by rotation of the control handle. The valve (Fig. 1) is installed on the P6 panel.
 6.  Mask Storage Box
________________
 A.  A mask storage box is installed at the captain's and first officer's stations. The box supplies storage for the mask/regulator and controls the flow of oxygen to the mask/regulator (Fig. 3).
 B.  The box contains a sliding control, a shutoff valve, left and right lids, and a flow blinker.
 C.  The sliding control automatically keeps the shutoff valve in the closed position when the mask/regulator is stored and both lids are closed. Hold the sliding control in TEST. This permits the mask/regulator to be tested when in the stored position. The inner part of the sliding control has a white flag marked OXY-ON.
 D.  The left lid controls the shutoff valve when the mask/regulator is removed from the box. The left lid also moves the sliding control's white flag to the exposed position when the mask/regulator is removed and the left lid is closed.
 E.  The flow blinker contains a yellow diaphragm and a black diaphragm. When oxygen flow occurs, the yellow diaphragm is pushed up against the black diaphragm. This causes a yellow cross to appear.
 7.  Mask/Regulator
______________
 A.  A mask/regulator (Fig. 3) is installed at each crew member's station. At the captain's and first officer's stations the mask/regulator is kept in a mask storage box. At the first observer's station, a mask cup is installed for mask/regulator storage.
 B.  The mask/regulator contains an oxygen mask with a microphone, an
 inflatable harness, and a diluter demand regulator.

 C.  The mask harness is inflated with oxygen when the harness inflation ears on the regulator are pressed. The harness inflates rapidly to a large, round, and rigid shape. This permits the mask/regulator to be put on rapidly. Release the inflation ears and the harness deflates which permits it to conform to the shape of the head.
 D.  The regulator has three manual controls - harness inflation ears, an oxygen dilution control, and a PRESS TO TEST knob.
 (1)  
The harness inflation ears are used to inflate and deflate the mask harness.

 (2)  
The oxygen dilution control is used to select a flow of 100% oxygen.

 (3)  
The PRESS TO TEST knob has two functions. One, turn the knob for a positive flow of oxygen under pressure. Two, depress the knob. This permits the regulator to be tested when the mask/regulator is in the mask storage box. The oxygen dilution control must be at 100% for this to occur.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
STORAGE BOX SEE A
CAPTAIN'S SIDEWALL
FLOWMASK/REGULATOR
BLINKER SEE B
OXYGEN
RESET
TEST
MASK
100% PUSH
SLIDING CONTROL
STORAGE BOX (DOORS CLOSED)
A
PNEUMATIC HARNESS
REGULATOR
SEE C
MASK/REGULATOR
(SHOWN INFLATED)

B
STORAGE BOX SEE A
FIRST OFFICER'S SIDEWALL
SHUTOFF
VALVE
　
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