737 MAX Flight Crew Operations Manual
Air Systems -
Controls and Indicators
MN-FLT-OH-201
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.
March 1, 2021
