737 Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Systems Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 1.40.21
Flight Crew Oxygen System
YW273, YW274
The flight crew oxygen system uses quick-donning, diluter-demand masks/
regulators located at each crew station. Oxygen is supplied by a single cylinder.
Oxygen pressure is displayed on the Oxygen Pressure indicator located on the aft
overhead panel when the battery switch is ON. Oxygen flow is controlled through
an in-line, pressure-reducing regulator to supply low-pressure oxygen to the
regulator on the mask. System pressure may be as high as 1850 psi.
YK981 - YQ456
The flight crew oxygen system uses quick-donning, automatic pressure-breathing
masks/ regulators located at each crew station. Pressure breathing occurs above
27,000 feet. Oxygen is supplied by a single cylinder. Oxygen pressure is displayed
on the indicator located on the aft overhead panel. Oxygen flow is controlled
through a pressure-reducing regulator to supply low-pressure oxygen. System
pressure may be as high as 1850 psi.
Oxygen flow is controlled by a regulator mounted on the oxygen mask. By
pushing the NORMAL/100% control lever, the regulator is adjusted from the
air/oxygen mixture to 100% oxygen. By rotating the EMERGENCY/TEST
selector, the regulator is adjusted to supply oxygen under pressure.
Flight Crew Oxygen Mask Usage
Donning Instructions
To don the oxygen mask accomplish the following:
• Grasp the regulator by the red inflation levers with the hand nearest the
stowage box.
• Squeeze the inflation levers while pulling the mask from the box.
• Pull the mask across in front of you, toward the center of the airplane (to
ensure ample hose extension) while rolling the mask face-up.
• 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.
September 15, 2016
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