737 Flight Crew Operations Manual
Airplane General, Emergency
Equipment, Doors, Windows -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
1.30.20 D6-27370-866-EGP
3 EMERGENCY/PRESS TO TEST Selector
Normal (non-emergency) position - supplies air/oxygen mixture or 100% oxygen
on demand, depending upon the position of the Normal/100% switch.
Automatically supplies 100% oxygen under positive pressure when cabin altitude
is above a preset value.
EMERGENCY position (rotate in the direction of the arrow) - supplies 100%
oxygen under positive pressure at all cabin altitudes (protects against smoke and
harmful vapors). Use to purge contaminants from mask and to remove
condensation or fogging from interior of mask lens.
CAUTION: Use of EMER mode depletes oxygen supply at higher rate than
100% or NORM mode. Use EMER mode only as conditions
require.
Note: Communications in EMER mode may be difficult. Switch to 100% or
NORM if conditions allow.
PRESS TO TEST – tests positive pressure supply to regulator.
Water System Controls
1 Water Quantity Indicator
Indicates quantity of water in reservoir.
2 Water System Service Panel
AFT ATTENDANT
PANEL
BELOW AFT ENTRY
DOOR
1
4
3
2
5
6
September 15, 2016
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