737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
MN-FLT-OH-201
SP.16.9
An increase in control forces can be expected at low
temperatures.
Before Takeoff Procedure
Do the normal Before Takeoff Procedure with the following modifications:
Call “FLAPS ___” as needed for takeoff.
PF
Flap lever .................................. Set takeoff flaps, as needed
PM
Extend the flaps to the takeoff setting at this time if they
have been held because of slush, or standing water, or icing
conditions, or because of exterior de-icing/anti-icing.
Verify that the LE FLAPS EXT green light is illuminated.
Takeoff Procedure
Do the normal Takeoff Procedure with the following modification:
When engine anti-ice is required and the OAT is 3°C or below, the takeoff
must be preceded by a static engine run-up. Use the following procedure:
Run-up to a minimum of 70% N1 and confirm stable engine operation
before the start of the takeoff roll. A 30-second run-up is highly
recommended whenever possible.
Engine Anti-Ice Operation - In Flight
Engine anti–ice must be ON during all flight operations when icing
conditions exist or are anticipated, except during climb and cruise when
the temperature is below -40°C SAT. Engine anti–ice must be ON before,
and during descent in all icing conditions, including temperatures below
-40°C SAT.
When operating in areas of possible icing, activate engine anti–ice before
entering icing conditions.
WARNING: Do not rely on airframe visual icing cues before
activating engine anti–ice. Use the temperature and
visible moisture criteria because late activation of
engine anti-ice may allow excessive ingestion of ice and
result in engine damage or failure.
CAUTION: Do not use engine anti-ice when TAT is above 10°C
When engine anti-ice is needed:
YA201 - YD256, YF631 - YV671
ENGINE START switches ..............................CONT
PM
March 1, 2021
