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flight by the control force necessary to maintain the flight path. With the
autopilot engaged, the condition can be recognized by a sustained control wheel
deflection opposite to the direction of the rudder trim. If the trim continues to
the limit of the autopilot control wheel deflection, the aircraft will turn in the
direction of the trimmed rudder while holding opposite aileron. If the trim
continues beyond the limits of the autopilot, the autopilot will disengage,
resulting in an abrupt roll / yaw in the direction of the rudder deflection.
Sec. 3 Page 140 737
Rev. 11/15/02 #41 Continental Flight Manual
FUEL MANAGEMENT
When established in cruise, the crew should verify that the fuel remaining on
board meets or exceeds all requirements for a safe completion of the flight. This
can be done via FMC forecast of fuel on board at destination compared to flight
plan fuel estimates. Fuel verification should occur periodically throughout the
flight.
Note: To ensure accurate forecast fuel at destination, all significant winds
aloft information should be entered on the RTE DATA page.
Center Tank Fueled (No Aux. Tank or Aux. Tank Empty):
Climb and Cruise............................... SIX PUMPS ON AND CROSSFEED
SELECTOR CLOSED
In this configuration, both engines are being pressure fed from the center
tank, with tanks No. 1 and No. 2 standing by as backups. This
configuration is maintained throughout the entire flight. As the center tank
quantity decreases to near empty, one LOW PRESSURE caution light may be
illuminated before the other. As the center tank runs dry, the two center
tank LOW PRESSURE lights will illuminate. The engines will now be
pressure fed from tanks No. 1 and No. 2.
During takeoff or initial climb, if a center tank LOW PRESSURE light(s)
illuminates, the center tank pump(s) may remain on until the climb attitude
is reduced and the light(s) extinguishes or workload allows for the pump(s)
to be positioned to OFF. When established in a level attitude at cruise, if the
center tank contains usable fuel and the center tank switches are off, center
tank pump switches may be positioned to ON again. Verify the LOW
PRESSURE light extinguish and position both switches to OFF when both LOW
PRESSURE lights illuminate.
Center Tank LOW PRESSURE Illuminated ..... PUMP SWITCHES OFF
Center tank fuel pump switches must be positioned to OFF when both center
tank fuel pump low pressure lights illuminate. Any residual fuel will be
transferred to the No. 1 tank by the center tank scavenge system.
737 Sec. 3 Page 141
Flight Manual Continental Rev. 11/15/02 #41
Center and Auxiliary Tanks Fueled (Aux. Tank Installed):
Climb and Cruise....................................................... ALL PUMPS ON AND
CROSSFEED SELECTOR CLOSED
In this configuration, engine No. 2 is being pressure fed from the center
tank, engine No. 1 is being fed from the auxiliary tank, and wing tanks No.
1 and No. 2 are standing by as back ups. As the auxiliary tank quantity
decreases to near empty, one LOW PRESSURE caution light may illuminate
before the other. When the auxiliary tank runs dry, the two auxiliary tank
LOW PRESSURE lights illuminate. Fuel feed now reverts to the same as the
Center Tank Fueled (No Aux Tank or Aux Tank Empty) procedure.
Auxiliary Tank LOW PRESSURE
Lights Illuminated........................................... PUMP SWITCHES OFF
Confirm auxiliary tank quantity is zero, and place the auxiliary tank fuel
pump switches OFF.
Fuel Balancing:
Maintain No. 1 and No. 2 tank fuel balance within limitations.
Note: Fuel pump pressure should be supplied to the engines at all times.
Above 30,000 feet without fuel pump pressure a thrust deterioration
may occur.
If the Center/Aux tank contains fuel:
Center/Aux Tank Pump Switches.....................................................OFF
Crossfeed Selector ............................................................................OPEN
Fuel Pump Switches (Low Tank) ......................................................OFF
When quantities are balanced:
Fuel Pump Switches (Main Tank) ......................................................ON
Center/Aux Tank Fuel Pump Switches ..............................................ON
Crossfeed Selector ......................................................................... CLOSE
If the Center/Aux tank contains no fuel:
Crossfeed Selector ............................................................................OPEN
Fuel Pump Switches (Low Tank) ......................................................OFF
Sec. 3 Page 142 737
Rev. 11/15/02 #41 Continental Flight Manual
When quantities are balanced:
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737 FLIGHT MANUAL 737飞行手册2(21)
