737 Flight Crew Operations Manual
Air Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 2.10.11
9 Outflow VALVE Position Indicator
• indicates position of outflow valve
• operates in all modes.
10 Outflow Valve Switch (spring–loaded to center)
CLOSE – closes outflow valve electrically with pressurization mode selector in
MAN position.
OPEN – opens outflow valve electrically with pressurization mode selector in
MAN position.
11 Pressurization Mode Selector
AUTO – pressurization system controlled automatically.
ALTN – pressurization system controlled automatically using ALTN controller.
MAN –
• pressurization system controlled manually by outflow valve switch
• both auto controllers bypassed.
12 Cabin /Flight Altitude (CAB ALT)(FLT ALT) Placard
Used to determine setting for cabin altitude when operating in manual mode.
September 15, 2016
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