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warmer air mass to achieve a TAT equal to or higher than
the fuel temperature limit.
TAT will increase approximately 0.5 to 0.7 degrees C for
each .01 Mach increase in speed. In extreme conditions,
it may be necessary to descend as low as FL250.
Condition: An inadvertent increase in quantity in the center tank
and a decrease in quantity in either main tank can
result in excessive main tank imbalance.
MAIN TANK FUEL PUMP SWITCHES
(decreasing main tank) . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
Note: At high altitude, thrust deterioration or engine
flameout may occur.
When the main tank fuel pump LOW PRESSURE lights
illuminate:
CENTER TANK FUEL PUMP
SWITCH (affected side) . . . . . . . . . . . . . . . . . . . . . . . . . .ON
When the center tank fuel pump LOW PRESSURE lights
extinguishes:
MAIN TANK FUEL PUMP SWITCHES. . . . . . . . . . . . . . . .ON
Continued on next page
FUEL TEMP LOW
INADVERTENT TRANSFER OF FUEL
INTO CENTER TANK
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 12.11
12.11
Continued from previous page
When the center tank fuel pump LOW PRESSURE light
illuminates:
CENTER TANK FUEL PUMP SWITCH
(affected side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF
Repeat the above steps as necessary.
Condition: A minimum fuel condition exists when the quantity in
any main tank is 1000 pounds (453 kilograms) or less.
The minimum fuel condition may be caused by an engine
fuel leak. For indications of an engine fuel leak, check:
• total fuel remaining compared to planned fuel remaining
• fuel flow indications, for an engine with excessive fuel
flow
• individual tank quantities.
If there is any indication of an engine fuel leak:
Accomplish the ENGINE FUEL LEAK checklist.
If the minimum fuel condition occurs without any indication
of an engine fuel leak:
MAIN TANK FUEL PUMP SWITCHES. . . . . . . . . . . .ALL ON
CROSSFEED SELECTOR . . . . . . . . . . . . . . . . . . . . . . OPEN
[Ensures remaining fuel available to both engines.]
Apply thrust changes slowly and smoothly. If a climb is
required, maintain the minimum pitch attitude required
for safe flight.
[Minimizes the possibility of uncovering the fuel pumps.]
MINIMUM FUEL OPERATION
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

12.12
12.12
Intentionally
Blank
June 3, 2005
737 Flight Crew Operations Manual
Non-Normal Checklists Chapter NNC
Hydraulics Section 13
Copyright © The Boeing Company. See title page for details.
 TOC.13.1
Table of Contents
NNHC.Y13D NRonA-NUorLmaIlC C hPeUcklMistsP-H LydOraWuli cPs RESSURE . . . . . . . . . . . . . . . . . . . 13.1
HYDRAULIC PUMP OVERHEAT . . . . . . . . . . . . . . . . . . . . . . . . 13.1
LOSS OF SYSTEM A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2
LOSS OF SYSTEM B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.4
MANUAL REVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.8
STANDBY HYDRAULIC LOW PRESSURE . . . . . . . . . . . . . . 13.11
STANDBY HYDRAULIC LOW QUANTITY . . . . . . . . . . . . . . 13.11
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
TOC.13.2
Non-Normal Checklists -
Hydraulics
Intentionally
Blank
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
 13.1
13.1
NNC.13 Non-Normal Checklists-Hydraulics
Condition: A hydraulic pump LOW PRESSURE light illuminated
indicates output pressure of the related pump is low.
HYDRAULIC PUMP SWITCH . . . . . . . . . . . . . . . . . . . . . . . .OFF
[Intermittent illumination of the hydraulic pump LOW PRESSURE light
may be the result of single electric pump operation and a high demand on
the hydraulic system.]
Condition: A hydraulic pump OVERHEAT light illuminated
indicates a fluid or motor overheat in the related
electric motor-driven pump.
ELECTRIC HYDRAULIC PUMP SWITCH . . . . . . . . . . . . . .OFF
[One pump provides adequate pressure for normal system operation.]
HYDRAULIC PUMP LOW PRESSURE
HYDRAULIC PUMP OVERHEAT
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.

13.2
13.2
Condition: Both system A hydraulic pump LOW PRESSURE
　
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