737 MAX Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
SP.16.22
MN-FLT-OH-201
Note:
Use a filtered ground cart for pneumatic air for engine start, if
available.
ENGINE START switch ............................................. GRD
F/O
Verify that the N2 RPM increases.
C, F/O
Motor the engine for 2 minutes to help remove contaminants.
YT702 - YV671
CAUTION: Do not apply rotational force when moving the engine
start lever.
Engine start lever...............................................IDLE detent
C
Before Taxi Procedure
Do the normal Before Taxi Procedure with special emphasis on the
following steps:
If bleed air is needed to maintain tolerable flight deck and cabin
temperatures, use APU bleed air rather than engine bleed air during the
taxi out. Limit APU bleed air use as much as possible to reduce sand and
dust ingestion.
If APU bleed air will be used and the APU is not operating:
APU switch ................................................... START
F/O
Note:
Run the APU for one full minute before using it as a bleed
air source.
Engine BLEED air switches ...............................OFF
F/O
APU BLEED air switch ....................................... ON
F/O
Flight controls ............................................................ Check
C
Verify that there is no increase in control forces due to sand
or dust contaminants.
Taxi–Out
Do the following, conditions permitting, to minimize sand and dust
ingestion by the engines and to improve visibility during taxi:
• Use all engines during taxi and taxi at low speed. Limit ground
speed to 10 knots and maintain thrust below 40% N1 whenever
possible to avoid creating engine vortices during ground
operations.
• Maintain a greater than normal separation from other aircraft while
taxiing and avoid the ingestion of another engine’s wake.
• Avoid engine overhang of unprepared surfaces.
March 1, 2021
