737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
MN-FLT-OH-201
SP.16.19
PACK switches ...............................................................................HIGH
Temperature selectors ........................................................AUTO COOL
Prior to takeoff:
PACK switches ..............................................................................AUTO
Engine BLEED 2 air switch ...............................................................ON
APU BLEED air switch.................................................................... OFF
Engine BLEED 1 air switch ...............................................................ON
ISOLATION VALVE switch .........................................................AUTO
Temperature selectors ..............................................................As needed
Moderate to Heavy Rain, Hail or Sleet
Flights should be conducted to avoid thunderstorm or hail activity. If
visible moisture is present at high altitude, avoid flight over the storm cell.
(Storm cells that do not produce visible moisture at high altitude can be
overflown safely.) To the maximum extent possible, moderate to heavy
rain, hail or sleet should also be avoided.
If moderate to heavy rain, hail or sleet is encountered or anticipated:
ENGINE START switches ..................................................CONT
Autothrottle ...................................................................Disengage
Thrust Levers.......................................................... Adjust Slowly
If thrust changes are necessary, move the thrust levers slowly.
Avoid changing thrust lever direction until engines have
stabilized at a selected setting. Maintain an increased minimum
thrust setting.
IAS/MACH .....................................................Use a slower speed
Using a slower speed improves engine tolerance to heavy
precipitation intake.
Consider starting the APU (if available).
March 1, 2021