One PACK switch .................................................................... AUTO

ISOLATION VALVE switch ................................................... AUTO

Pressurization mode selector ....................................MAN AC/MAN

FLT/GRD switch (as installed)................................................................................GRD
Copyright . The Boeing Company. See title page for details.
SP.16.10  June 4, 2004

Supplementary Procedures -Adverse Weather 737 Operations Manual
Outflow valve switch ............................................................... OPEN Prevents aircraft pressurization.
Note: The airplane must be parked into the wind when the outflow valve is full open. APU BLEED switch......................................................................ON
CAUTION: With packs operating and all doors closed, inadvertent closure of the main outflow valve could result in unscheduled pressurization of the airplane. With the airplane in this configuration, do not leave the interior unattended.
Secure (Airplane Unattended)
If remaining overnight at off-line stations or at airports where normal support is not available, the flight crew should arrange for or ascertain that the following actions have been accomplished.
Pressurization mode selector ......................................... MAN AC/MAN
Outflow valve ................................................................................Closed
Wheel chocks....................................................................Check in place
Parking brakes .................................................................................. OFF

Eliminates the possibility of brakes freezing.
Protective covers and plugs ........................................................Installed
Water storage containers..............................................................Drained
Toilets ..........................................................................................Drained
Battery ...................................................................................... Removed

If the battery will be exposed to temperatures below -18° C (0° F), the battery should be removed and stored in an area warmer than -18° C (0° F), but below 40° C (104° F.) Subsequent, installation of the warm battery will ensure the starting capability of the APU.
Doors and sliding windows ...........................................................Closed

Supplementary Procedures -Adverse Weather 737 Operations Manual

Hot Weather Operation
During ground operation the following considerations will help keep the airplane as cool as possible:
.  
If cooling air is available from an outside source, the supply should
be plugged in immediately after engine shutdown and should not
be removed until just prior to engine start.

.  
Keep all doors and windows, including cargo doors, closed as
much as possible.

.  
Electronic components which contribute to a high temperature
level in the flight deck should be turned off while not needed.

.  
Open all passenger cabin gasper outlets and close all window
shades on the sun–exposed side of the passenger cabin.

Note: On airplanes with aspirated TAT, if only cooling air from a ground air conditioning cart is supplied (no pressurized air from the APU or ground external air), then the TAT probes are not aspirated. Because of high TAT probe temperatures, the FMC’s may not accept an assumed temperature derate. Delay selecting an assumed temperature derate until after bleed air is available.
Brake temperature levels may be reached which can cause the wheel fuse plugs to melt and deflate the tires. Consider the following actions:
.  
Be aware of brake temperature buildup when operating a series of
short flight sectors. The energy absorbed by the brakes from each
landing is accumulative.

.  
Extending the landing gear early during the approach provides
additional cooling for tires and brakes.

.  
In–flight cooling time can be determined from the “Brake Cooling

Schedule” in the Performance–Inflight section. During flight planning consider the following:
.  
High temperatures inflict performance penalties which must be
taken into account on the ground before takeoff.

.  
Alternate takeoff procedures (No Engine Bleed Takeoff, Improved
Climb Performance, etc.)

Moderate to Heavy Rain
Flights should be conducted to avoid thunderstorm or hail activity by overflight or circumnavigation. To the maximum extent possible, moderate to heavy rain should also be avoided.
　
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