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If parking for an extended period and extreme cold temperatures are expected, consider parking on sand or similar material to prevent freeze down.
In blowing snow, engine covers may be required, depending on length of stop. After engine shut down, check engines’ air inlets for presence of water and/or ice. Remove any accumulations before installing engine inlet plugs and covers. If remaining overnight, ensure all cabin doors, cargo compartment doors, access doors, sliding windows, and outflow valves are closed.
HOT WEATHER OPERATION
Airplane operation in extremely high temperature conditions presents problems of a different nature than those associated with cold weather. High ground temperatures have important effects on passenger and crew comfort and generally decrease aircraft performance. The following information is intended to supplement the normal operating procedures.
Every effort to keep the interior of the airplane as cool as possible is important. All doors to the airplane should be kept closed as much as possible. The cockpit windows must be kept closed and cargo doors should not be left open any longer than necessary. The Flight Attendants should check all gasper outlets open and close the window shades on the hot (sun exposed) side of the passenger cabin. All air conditioning packs should be used (when possible) for maximum cooling.
If cooling air is available from an outside source, the supply should be plugged in immediately after engine shut down and should not be removed until just prior to engine start.
Consideration should be given to reducing the heat being generated in the cockpit. Window heat, radar, and other electronic components which contribute to a high temperature level in the cockpit should be turned off while the airplane is on the ground. Windshield air, foot air vents, and all the air outlets in the cockpit should be open.
To attain maximum cooling on ground, follow these procedures: IF External Air Is Available:
APU AIR Switch ..................................................................................OFF Air Conditioning Supply Switches....................................................AUTO IF Pneu Press Is Less Than 20 PSI:
APU AIR Switch ............................................................................ ON Note: If cabin temperature is 75° or higher, move APU AIR switch to AIR COND COLDER.
IF External Air Is Not Available:
APU AIR Switch ................................................................................... ON Note: If cabin temperature is 75° or higher, move APU AIR switch to AIR COND COLDER.
Air Conditioning Supply Switches....................................................AUTO

IF Air Conditioning Press is Less Than 12 PSI:
Operate only one air conditioning system.
Taxi Out
When operating in areas of high ambient temperatures, brake temperature levels may be reached which will cause the wheel fuse plugs to melt and deflate the tires. Consideration for brake cooling should be taken into account when operating on runways and taxiways exposed to high temperatures since these areas maintain temperatures considerably above ambient. Allow the airplane to accelerate, then brake to a very slow taxi speed. Release the brakes and repeat the sequence. Gross weight permitting, single engine taxi may help to avoid excess brake usage. For optimum passenger comfort, use APU bleed air to supplement engine bleed for pack operation if taxiing with two engines.
Brake Cooling
Flight crews should be aware of brake temperature buildup when operating a series of short flight segments. They should attempt to maintain cool brakes by additional in-flight cooling prior to each landing to prevent ground delays resulting from overheated brakes and possible loss of main wheel fuse plugs at enroute stops. A series of short flight segments, without additional in-flight brake cooling, can cause excessive brake temperatures as the energy absorbed by the brakes from each landing is accumulative.
Leaving the gear extended for several minutes after takeoff will provide cooling for tires and brakes (important if on a short flight segment).
Extending the gear a few minutes early in the approach will provide sufficient cooling for a landing with cool tires and brakes.
Close adherence to recommended landing rollout procedures will ensure minimum brake temperature buildup. Quick turnaround limitations apply.
Descent
During descent to an airport with high OAT, it is recommended to pre-cool the cabin by selecting FULL COLD on the cabin temperature selectors. This will aid in maintaining a more comfortable cabin temperature while on the ground.
LANDING ON WET OR SLIPPERY RUNWAYS
The flight crew must be aware of the condition of the runway with respect to snow, ice, slush, or precipitation. The most favorable runway in relation to surface condition, wind, and weather should be used. In very general terms, landing on a wet runway increases the stopping distance approximately 1000 feet over a dry runway, and landing on an icy runway increases the stopping distance by more than 3000 feet. Use maximum landing flap configuration when landing on a contaminated runway.
　
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