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Flight Manual
Continental
FUEL
Sec. 2.12 Page 3
Rev. 11/15/02 #41
FUEL PUMP LOW PRESSURE
Fuel pump LOW PRESSURE lights may flicker when tank quantity is low and the
aircraft is in turbulent air or during climb or descent.
IF One Main Tank LOW PRESSURE Light Is Illuminated:
Main Tank Fuel Pump Switch (Affected Side)................................OFF
Sufficient fuel pressure is available for normal operation.
* * * *
IF Both Main Tank LOW PRESSURE Lights Are Illuminated:
Above 30,000 feet, a thrust deterioration or engine flameout may occur.
* * * *
IF One Center Tank LOW PRESSURE Light Is Illuminated:
Crossfeed Selector ............................................................................OPEN
This prevents fuel unbalance.
Center Tank Fuel Pump Switch (Affected Side) .............................OFF
When the center tank fuel is depleted:
Crossfeed Selector ..........................................................................CLOSE
Remaining Center Tank Fuel Pump Switch....................................OFF
* * * *
IF Both Center Tank LOW PRESSURE Lights Are Illuminated:
Both Center Tank Fuel Pump Switches....................................OFF
Center tank fuel is unusable.
Main tank fuel may not be sufficient for the planned flight.
* * * *
(Continued)
FUEL
Sec. 2.12 Page 4
Rev. 11/15/02 #41
Continental
737
Flight Manual
IF One Auxiliary Tank LOW PRESSURE Light Is Illuminated:
Sufficient fuel pressure is available for normal operation.
* * * *
IF Both Auxiliary Tank LOW PRESSURE Lights Are Illuminated:
Auxiliary Tank Fuel Is Unusable.
Use only main tank fuel for remainder of flight to avoid exceeding aft
C.G. limits. Check fuel required to destination or suitable alternate.
Remaining main tank fuel may not be sufficient for the planned flight.
Center Tank Fuel Pump Switches ....................................................OFF
* * * *
737
Flight Manual
Continental
FUEL
Sec. 2.12 Page 5
Rev. 11/15/02 #41
FUEL QUANTITY INDICATOR INOPERATIVE
If a fuel quantity indicator fails:
IF >>@:
VNAV............................................................................DISENGAGE
FMC gross weight calculations may be inaccurate with an
inoperative fuel quantity indicator.
If fuel quantity in the FMC is not correct:
· Do not use FMC speed and altitude information.
· Use manually calculated gross weight and performance
information from the QRH.
· On speed tape equipped aircraft, do not use minimum
maneuver speeds or buffet margin information.
* * * *
IF BCD:
FMC Fuel Weight.................................................................. ENTER
Enter and periodically update manually calculated fuel on the
FMC PERF INIT page. This will be done at no less than 30
minute intervals for the remainder of the flight. VNAV is
available for use.
* * * *
BCD IMBAL
The fuel IMBAL annunciation indicates main fuel tank quantities differ by more
than 1000 lbs.
Fuel ...................................................................................................BALANCE
* * * *
OR
FUEL
Sec. 2.12 Page 6
Rev. 11/15/02 #41
Continental
737
Flight Manual
INADVERTENT TRANSFER OF FUEL
INTO CENTER TANK
An inadvertent increase in fuel quantity in the center tank and a decrease in fuel
quantity in either the No. 1 or No. 2 main tank, can result in excessive fuel
imbalance between the main tanks. This condition can result from a check
valve failure in the center tank. With this failure, the main tank pumps are
pumping fuel into the center tank. Because the fuel is entering from the wrong
direction, the center boost pump is probably turning backwards. This procedure
stops this reverse pump operation and can prevent or reduce an excessive lateral
imbalance condition
Fuel Pump Switches (Decreasing Main Tank) .......................................OFF
Turning off FUEL PUMP switches stops back pressure against center tank
pump.
Note: Above 30,000 feet, thrust deterioration or engine flameout may
occur.
When The Main Tank Fuel Pump LOW PRESSURE Light Is Illuminated:
Center Tank Fuel Pump Switch (Affected Side) ......................................ON
Leave affected center tank fuel pump switch ON and crossfeed selector
closed for the remainder of the flight.
The center tank fuel pump remains ON, even after the LOW PRESSURE light
illuminates. This prevents fuel from being pumped through the failed
center tank check valve and again entering the center tank.
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737 FLIGHT MANUAL 737飞行手册1(79)
