Fueling hose nozzle ....................Attached to the refueling receptacle
Fueling valves ................................ Open for the tanks to be refueled
Note: Main tanks No. 1 and No. 2, and the center tank refueling valves each have a red override button that must be pressed and held while fuel is being pumped into the tank. Releasing the override button allows the spring in the valve to close the valve.
Caution must be observed not to overfill a tank, since there is no automatic fuel shutoff during manual operation. When the desired amount of fuel has been pumped into the tanks, the refueling valves for the respective tanks can be released.
Ground Transfer of Fuel
Fuel can be transferred from one tank to another tank by using the appropriate fuel pumps, the fueling valve, the defueling valve, and the crossfeed valve. AC power must be available. To transfer fuel from the main tanks to the center tank:
Main tank fuel pump switches............................................................ON
Crossfeed selector ............................................................................ Open
Manual defueling valve ................................................................... Open
Center tank fueling valve switch ................................................... OPEN
Fuel transfer .................................................................................Monitor
The center tank fuel quantity indicator shows an increase in fuel.
The main tank indicators show a decrease in fuel.
Center tank fueling valve switch .............................................. CLOSED When the required amount of fuel has been transferred, the switch is closed at the fueling panel.
Manual defueling valve ...................................................................Close
Crossfeed selector ............................................................................Close
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Fuel 737 Flight Crew Operations Manual
Main tank fuel pump switches ..........................................................OFF
Main Tanks ...................................................................................... Refill
Refueling panel and defuel panel access doors ............................... Close
Fuel Crossfeed Valve Check
Crossfeed selector ............................................................................Open Verify crossfeed VALVE OPEN light illuminates bright and then dim.
Crossfeed selector ........................................................................... Close Verify crossfeed VALVE OPEN light illuminates bright and then extinguishes.
Copyright . The Boeing Company. See title page for details.
737 Flight Crew Operations Manual
Introduction
Airplane operation in adverse weather conditions may require additional considerations due to the effects of extreme temperatures, precipitation, turbulence, and windshear. Procedures in this section supplement normal procedures and should be observed when applicable.
The following recommendations apply to adverse weather operations in general:
.
Do not use assumed temperature reduced thrust for takeoff on a
contaminated runway.
.
V1 may be reduced down to minimum V1 (assuming all weight
limitations are considered) to provide increased stopping distance
performance.
.
Takeoffs on slippery runways are not recommended when slush or
wet snow is more than 1/2 inch (13mm) in depth.
.
Improved stall margins can be achieved by the following:
.
If excess runway is available, consider using improved climb procedures for flaps 5.
.
If runway is limited for the planned takeoff flap setting, consider using the next greater flap position with improved climb performance. This will provide additional stall margins with minimum performance penalties.
Cold Weather Operation
Considerations associated with cold weather operation are primarily concerned with low temperatures and with ice and snow on the airplane, ramps, taxiways and runways.
Icing conditions exist when OAT (on the ground) or TAT (in-flight) is 10°C (50°F) or below and:
.
visible moisture (clouds, fog with visibility less than one mile, rain,
snow, sleet, ice crystals, and so on) is present, or
.
standing water, ice, or snow is present on the ramps, taxiways, or
runways.
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