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FQPU calculates fuel density from the change in the resonant
frequency.
Training Information Point
The terminal posts have different dimensions to prevent errors
in installation.
FUEL INDICATING - DENSITOMETER
EFFECTIVITY
GUN 201-999 28-41-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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28-41-00-015
CAUTION: MAKE SURE YOU INSTALL EACH NUT ON THE
WIRING TERMINALS TO THE CORRECT TORQUE.
IF YOU TIGHTEN THE NUTS TO MORE THAN THE
SPECIFIED TORQUE, DAMAGE TO THE
DENSITOMETER TERMINAL BLOCK CAN OCCUR.
FUEL INDICATING - DENSITOMETER
EFFECTIVITY
GUN 201-999 28-41-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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28-41-00-015
FUEL INDICATING - DENSITOMETER
FUEL INDICATING - DENSITOMETER
EFFECTIVITY
GUN 201-999 28-41-00
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D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-41-00-015
General
GUN 001-099, 101-115
There is one wire harness in each tank. Each wire harness
connects to the fuel tank units and the compensator in each
tank. Each wire harness connects to a feed through connector
inside the fuel tank. Outside the tank, each spar connector
attaches to a busing plug. Each busing plug connects to the fuel
quantity processor unit.
GUN 201-999
There is one wire harness in each tank. Each wire harness
connects to the fuel tank units, the densitometer, and the
compensator in each tank. Each wire harness connects to a
feed through connector inside the fuel tank. Outside the tank,
each spar connector attaches to a busing plug. Each busing
plug connects to the fuel quantity processor unit.
GUN ALL
FUEL INDICATING - WIRE HARNESSES
EFFECTIVITY
GUN ALL 28-41-00
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FUEL INDICATING - WIRE HARNESSES
FUEL INDICATING - WIRE HARNESSES
EFFECTIVITY
GUN 001-099, 101-115 28-41-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-41-00-003
FUEL INDICATING - WIRE HARNESSES
FUEL INDICATING - WIRE HARNESSES
EFFECTIVITY
GUN 201-999 28-41-00
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D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-41-00-003
THIS PAGE IS INTENTIONALLY LEFT BLANK
FUEL INDICATING - WIRE HARNESSES
28-41-00
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D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The fuel quantity processor unit does these functions:
* Calculates fuel weight in each tank
* Calculates the total fuel weight
* Sends fuel weight to the common display system
* Sends fuel weight to the fueling panel (P15)
* Sends fuel weight to the flight management computer
* Monitors the fuel system for faults
* Stores faults in non-volatile memory
* Sends fault data to the control display units.
Location
The fuel quantity processor unit is on the aft bulkhead of the
forward equipment center.
FUEL INDICATING - FUEL QUANTITY PROCESSOR UNIT
EFFECTIVITY
GUN ALL 28-41-00
Page 20
D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FUEL INDICATING - FUEL QUANTITY PROCESSOR UNIT
FUEL INDICATING - FUEL QUANTITY PROCESSOR UNIT
EFFECTIVITY
GUN ALL 28-41-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
28-41-00-004
General
The fuel quantity processor unit (FQPU) connects to two isolated
28v dc power sources at a time. The fuel quantity processor unit
operates when one or both of the sources have power.
Power Sources
The FQPU can receive power from any of these three sources:
* 28v dc bus 1
* 28v dc hot battery bus
* 28v dc battery bus.
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