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air will be drawn into the manifold and fuel flow will stop.
Pressure Defuel
This is a summary of the pressure defuel procedure:
* Connect the refuel nozzles
* Move the handle on the defuel valve to the open position
* Turn on the boost pumps to the tank that you need to defuel
* Open the crossfeed valve if necessary
* Turn the boost pumps off when the tank is empty
* Move the handle on the defuel valve to the closed position
* Disconnect the fueling nozzles.
Suction Defuel
This is a summary of the suction defuel procedure:
* Connect the fueling nozzles
* Move the handle on the defuel valve to the open position
* Open the crossfeed valve if necessary
* Start to suction fuel with the ground source
* When the fuel tank is empty, move the handle on the defuel
valve to the closed position
* Disconnect the fueling nozzles.
Fuel Transfer
To transfer fuel between tanks you use the defuel system,
fueling system, and the engine fuel feed system. This is a
summary of the fuel transfer procedure:
* Move the defuel valve to the open position
* Turn on the boost pumps in the tank you want to defuel
* Open the crossfeed valve
* Move the refuel valve switch to the open position in the tank
you want to put fuel into
* After fuel transfer, turn the boost pumps off
* Close the crossfeed valve
* Move the defuel valve to the closed position.
DEFUEL - OPERATION
EFFECTIVITY
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DEFUEL - OPERATION
DEFUEL - OPERATION
EFFECTIVITY
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Fuel Quantity Indicating System (FQIS)
The FQIS measures fuel weight in the fuel tanks. The common
display system (CDS) and the fueling panel show fuel quantity.
FUEL INDICATING - INTRODUCTION
EFFECTIVITY
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FUEL INDICATING - INTRODUCTION
FUEL INDICATING - INTRODUCTION
EFFECTIVITY
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FUEL INDICATING - INTRODUCTION
FUEL INDICATING - INTRODUCTION
EFFECTIVITY
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FUEL INDICATING - INTRODUCTION
EFFECTIVITY
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General
The fuel quantity indicating system (FQIS) calculates the fuel
weight in each fuel tank. The fuel quantity of each tank shows on
the common display system (CDS). fuel quantity processor unit
(FQPU) calculates total fuel weight and supplies this to the
FMCS.
Operation
GUN 001-099, 101-115
The fuel quantity processor unit sends excitation to and
receives signals from the tank units and the compensators.
The fuel quantity processor unit uses these signals to calculate
fuel quantity in each tank.
GUN 201-999
The fuel quantity processor unit sends excitation to and
receives signals from the tank units, compensators, and
densitometers. The fuel quantity processor unit uses these
signals to calculate fuel quantity in each tank.
GUN ALL
Each refueling indicator has an overfill indication. The quantity
blinks on, then off, at a one second rate when the fuel in the tank
is more than maximum rated capacity.
FUEL INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
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