12.6
12.6
Condition: A fuel pump LOW PRESSURE light illuminated
indicates the related fuel pump output pressure is
low.
Note: Fuel pump LOW PRESSURE lights may flicker when
tank quantity is low and the airplane is in turbulent
air or during climb or descent.
If one main tank fuel pump LOW PRESSURE light is
illuminated:
MAIN TANK FUEL PUMP SWITCH . . . . . . . . . . . . . . . . .OFF
[Sufficient fuel pressure is available for normal operation.]
If both main tank fuel pump LOW PRESSURE lights are
illuminated:
Note: At high altitude, thrust deterioration or engine
flameout may occur.
If one center tank fuel pump LOW PRESSURE light is
illuminated:
CROSSFEED SELECTOR . . . . . . . . . . . . . . . . . . . . . . OPEN
[Prevents fuel imbalance.]
CENTER TANK FUEL PUMP SWITCH
(affected side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
When the other center tank fuel pump LOW PRESSURE
light illuminates:
CROSSFEED SELECTOR. . . . . . . . . . . . . . . . . . . CLOSE
REMAINING CENTER TANK
FUEL PUMP SWITCH . . . . . . . . . . . . . . . . . . . . . . . . .OFF
Continued on next page
FUEL PUMP LOW PRESSURE
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.7
12.7
Continued from previous page
If both center tank fuel pump 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.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.8
12.8
Condition: The related fuel quantity pointer is off scale,
fluctuating and/or uneven response to fuel quantity
indicator test.
(U3.1, 4, 5 and 7.1 FMC’s)
If a fuel quantity indicator fails:
VNAV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DISENGAGE
[FMC gross weight calculations are not provided with an inoperative
fuel quantity indicator.]
If fuel quantity in 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 airplanes, do not use
minimum maneuver speed or buffet margin
information.
Use the Flap Maneuver Speed table in the
Performance- Inflight section.
Stick shaker, VMO/MMO and minimum flap retraction speed
displays are unaffected.
CAUTION: If the FMC is used for manual entry of gross
weight to calculate reference speeds or fuel
remaining at destination, the information will
not remain accurate.
Continued on next page
FUEL QUANTITY INDICATOR
INOPERATIVE
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.9
12.9
Continued from previous page
(U7.5 and 10 FMC’s)
If dashes are displayed on the FUEL quantity line on the
FMC PERF INIT page:
FMC FUEL WEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . ENTER
Enter and periodically update manually calculated fuel
weight on the FMC PERF INIT page.
If dashes are not displayed on the FUEL quantity line on the
FMC PERF INIT page:
Do not use FMC speed and altitude information.
Use manually calculated gross weight and performance
information from the QRH.
Do not use minimum maneuver speed or buffet margin
information.
Use the Flap Maneuver Speed table in the Performance-
Inflight section.
Stick shaker, VMO/MMO and minimum flap retraction speed
displays are unaffected.
CAUTION: If the FMC is used for manual entry of gross
weight to calculate reference speeds or fuel
remaining at destination, the information will
not remain accurate.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.10
12.10
Condition: Fuel temperature is approaching minimum.
When fuel temperature is approaching fuel temperature
limit (3 degrees C (5 degrees F) above the fuel freeze point
or - 45 degrees C (- 49 degrees F) whichever is higher):
Increase speed, change altitude and/or deviate to a
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