Prevents aircraft pressurization. Note: The airplane must be parked into the wind when the outflow valve is full open. APU BLEED air switch .............................................. ON F/O
Secure Procedure (Airplane Unattended)
Do the following steps after completing the normal Secure Procedure:
If staying overnight at off-line stations or 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
Outflow valve .............................................................................. CLOSE
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Adverse Weather
737 Flight Crew Operations Manual
Wheel chocks....................................................................Check in place
Parking brake ............................................................................... Release
Protective covers and plugs ............................................................Install
Water storage containers ..................................................................Drain
Toilets ..............................................................................................Drain
Battery ........................................................................................ Remove
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 ensures the starting capability of the APU.
Doors and sliding windows .............................................................Close
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.
YA721, YA722 Note: 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.
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Adverse Weather 737 Flight Crew Operations Manual
YA613 - YA809 If these actions do not reduce cabin temperatures sufficiently:
PASSENGER CABIN temperature selector ......................................................................... AUTO COOL
PACK switches ......................................................................... HIGH
If the cabin temperature remains high:
PASSENGER CABIN temperature
selector......................................................................MAN COOL 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
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