737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Air Systems
SP.2.4
MN-FLT-OH-201
Outflow valve switch (momentarily) ................................ CLOSE
During descent, intermittently position the outflow valve switch
toward CLOSE, observing cabin altitude decrease as the airplane
descends.
Before entering the landing pattern, slowly position the outflow valve
to full open to depressurize the airplane. Verify differential pressure
is zero.
#Pressurization Control Operation – Landing at Alternate
Airport
At top of descent:
LAND ALT Indicator ...................................................................... Reset
Reset to new destination field elevation.
Automatic Pressurization Control – Departure Airport
Elevation Above 8400 Feet
YR601 - YR605
If departure airport elevation is above 10,000 feet:
Oxygen masks and regulators ....................................ON, Normal
Supplemental oxygen must be used from departure until the cabin
altitude is below 10,000 feet.
After electrical power is applied to the airplane:
HIGH ALT LDG switch........................................................... Off
Monitor CABIN ALT and CABIN rate of CLIMB indicators
during climbout to ensure cabin altitude is descending below 8500
feet, at which time the cabin altitude warning system is reset to
10,000 feet.
Note:
If departure airport elevation is above 9000 feet, the high
altitude landing mode may be active and the warning
system set at the High Altitude setpoint. If departure
airport elevation is above 11,000 feet, the high altitude
landing mode will be active and the warning system set at
the High Altitude setpoint. When the cabin altitude
descends below 8500 feet, the cabin altitude warning
system is reset to 10,000 feet.
If landing altitude is at or below 6000 feet:
LAND ALT indicator .......................... Destination field elevation
March 1, 2021