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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. Main tanks No. 1 and No. 2 may also be refueled through filler ports over the wing. It is not possible to refuel the center tank externally.
Ground Transfer of Fuel
Fuel can be transferred from one tank to another tank by using the appropriate fuel pumps, 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

Main tank fuel pump switches .......................................................... OFF

Main Tanks ......................................................................................Refill

Refueling panel and defuel panel access doors ...............................Close

Supplementary Procedures -Fuel 737 Operations Manual

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.
Fuel Quantity Indicators Test
Note: With a fuel quantity indicator inoperative, a zero fuel quantity input will be sent to the fuel summation unit causing a possible FMC gross weight error.
Fuel quantity test switch ................................................... Push and hold Hold until the fuel quantity indicators: (Simmond’s sunburst fuel quantity indicators) Drive to zero and
“ERR 4” is displayed.
(Smith’s sunburst fuel quantity indicators) Drive to zero and “ERR
0” is displayed.

Note: Do not push the QTY TEST switch when the airplane is being fueled. This will cause inaccurate indications at the external fueling panel.
Copyright . The Boeing Company. See title page for details.
SP.12.4  December 1, 2000

Supplementary Procedures -Fuel
737 Operations Manual
Fuel quantity test switch .............................................................. Release

Releasing the test switch initiates a self-test. The fuel quantity
indicators display:
(Simmond’s sunburst fuel quantity indicators)

.
 All segments for two seconds

.
 Blank for two seconds

.
 Stored error codes (if any) for two seconds each

.
 Indicator full scale value for up to two seconds

.
 Actual fuel quantity
(Smith’s sunburst fuel quantity indicators)

.
 “ERR 4” for approximately two seconds (early versions of
indicators)

.
 All segments for two seconds

.
 Blank for two seconds

.
 Stored error codes (if any) for two seconds each

.
 Indicator full scale value for up to two seconds

.
 Actual fuel quantity

Copyright . The Boeing Company. See title page for details.
December 1, 2000  SP.12.5
Supplementary Procedures -Fuel 737 Operations Manual

Intentionally
Blank

Copyright . The Boeing Company. See title page for details.
SP.12.6  December 1, 2000

737 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:
　
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