737 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP SP.16.17
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.
Cold weather maintenance procedures for securing the airplane may be
required. These procedures are normally done by maintenance personnel,
and include, but are not limited to:
• protective covers and plugs installed
• water storage containers drained
• toilets drained
• doors and sliding windows closed
• battery removed. If the battery will be exposed to temperatures
below -18°C, the battery should be removed and stored in an area
warmer than -18°C, but below 40°C. Subsequent installation of the
warm battery ensures the starting capability of the APU.
Hot Weather Operation
During ground operation the following considerations will help keep the
airplane as cool as possible:
• While the airplane is electrically powered, packs should be run or
cooling air supplied to the airplane when the OAT exceeds 40° C
(103° F) to protect the reliability of electrical and electronic
equipment in the airplane.
• 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.
September 15, 2016
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