737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
SP.16.16
MN-FLT-OH-201
Secure Procedure
Do the normal Secure Procedure with the following modifications:
If the airplane will be attended and warm air circulation throughout the
cargo E/E compartments is desired:
CAUTION: Do not leave the interior unattended with a pack
operating and all doors closed. With the airplane
in this configuration, accidental closure of the
main outflow valve can cause unscheduled
pressurization of the airplane.
APU ....................................................................Start
F/O
APU GENERATOR bus switches ....................... ON
F/O
PACK switches ............................................... AUTO
F/O
ISOLATION VALVE switch............................OPEN
F/O
Pressurization mode selector ............................MAN
F/O
Outflow valve switch .......................................OPEN
F/O
Prevents aircraft pressurization.
Note:
The airplane must be parked into the wind when the
outflow valve is full open.
APU BLEED air switch ....................................... ON
F/O
If the airplane will not be attended, or if staying overnight at off-line
stations or at airports where normal support is not available, the flight
crew must arrange for or verify that the following steps are done:
Pressurization mode selector ............................MAN
F/O
Outflow valve ................................................CLOSE
F/O
Position the outflow valve fully closed to inhibit the
intake of snow or ice.
Wheel chocks ......................................Verify in place
C or F/O
Parking brake ...............................................Released
C
Reduces the possibility of frozen brakes.
March 1, 2021
