.  
Lean slightly toward the center of the airplane and bring the mask toward your face so that the lower portion of the mask contacts your chin first. Roll the top of the mask toward your forehead so the harness goes over and behind your head.

.  
Release the inflation levers so the harness holds the mask in place.

Copyright . The Boeing Company. See title page for details.
March 28, 2005   1.40.17
Airplane General, Emergency Equipment, Doors, Windows -
 
Systems Description
737 Flight Crew Operations Manual
MASK DONNING
Stowing Instructions YA613, YA686 - YA722, YC153, YC154
To stow the oxygen mask accomplish the following:
.  
Set the “N/100%” regulator control to “100%.”

.  
Ensure that the “EMERGENCY” oxygen control knob is off.

.  
Coil the supply hose into the bottom of the stowage box, making the
largest diameter possible.

.  
Ensure that the harness is completely deflated.

.  
Hold the mask by the regulator, with the facepiece down and the inside of the mask toward you.

.  
Grasp the harness and pull it downward so the cross straps are below the facepiece. Allow the excess harness to hang downward.

Copyright . The Boeing Company. See title page for details.
1.40.18   September 26, 2003

Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
737 Flight Crew Operations Manual
CAUTION: Do not push the harness cross straps into or behind the nose piece. Doing this may cause the cross straps to hang up on the mask during inflation.
.  
Position the supply hose down the center of the facepiece.

.  
Insert the mask-regulator assembly into the stowage box, beginning with
the harness (regulator up).

.  
Press down on the assembly until the mask-regulator is fully seated
against the stop in the stowage box.

.  
Close the left-hand door. The “OXY ON” flag will slide into view at the
center of the door

.  
Close the right-hand door, ensuring not to pinch the hose

.  
Press, then release the “TEST AND RESET” control lever on the
left-hand door. Ensure that the “OXY ON” flag disappears when the
control lever is released.

WARNING: Do not squeeze the red inflation levers during stowing. Doing this will inflate the harness and prevent the correct stowing of the mask.
Copyright . The Boeing Company. See title page for details.
September 26, 2003   1.40.19
Airplane General, Emergency Equipment, Doors, Windows -
 
Systems Description
737 Flight Crew Operations Manual
STOP
OXY ON

N
N
100% PUSH
PRESS
TO
TEST
AND

EMERGENCY
PRESS RESET
TO
TEST SS O ST
MASK STOWING
Portable Protective Breathing Equipment
Protective Breathing Equipment (PBE/Smoke Hood) devices for crew use (for combating fires and/or entering areas of smoke or fume accumulation) may be stowed throughout the airplane; however, they are normally found in the forward and aft sections of the passenger cabin. The device is placed over the head and, when activated, provides approximately 15 to over 20 minutes of oxygen depending upon the device used. Manufacturer’s operating instructions are placarded on the container.
Passenger Oxygen System
The passenger oxygen system is supplied by individual chemical oxygen generators located at each Passenger Service Unit (PSU). Four continuous flow masks are connected to each generator. A generator with two masks is located above each attendant station and in each lavatory.
Copyright . The Boeing Company. See title page for details.
1.40.20  September 26, 2003

Airplane General, Emergency Equipment, Doors, Windows -Systems Description
737 Flight Crew Operations Manual
YA613 - YA687, YA803 - YK104 The system is activated automatically by a pressure switch at a cabin altitude of 14,000 feet or when the Passenger Oxygen Switch on the aft overhead panel is positioned to ON. When the system is activated, the PASS OXY ON light illuminates and OVERHEAD illuminates on the Master Caution System.
YA721 - YA802 The system is activated automatically by a pressure switch at a cabin altitude of 14,650 feet or when the Passenger Oxygen Switch on the aft overhead panel is positioned to ON. When the system is activated, the PASS OXY ON light illuminates and OVERHEAD illuminates on the Master Caution System.
Activating the system causes the masks to drop from the stowage compartments. The oxygen generators are activated when any mask in the unit is pulled down. Pulling one mask down causes all masks in that unit to come down and 100% oxygen flows to all masks. A green in–line flow indicator is visible in the transparent oxygen hose whenever oxygen is flowing to the mask. Oxygen flows for approximately 12 minutes and cannot be shut off. If the passenger oxygen is activated and a PSU oxygen mask compartment does not open, the masks may be dropped manually.
　
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