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The power source normally available is the 28v dc battery bus.
Transformer rectifier 3 (TRU3) is the normal power source for
this bus. However, the battery or battery charger may also
supply power to this bus if TRU3 power is not available and the
battery switch is in the ON position.
When the fueling station door is in the closed position,
processor unit power can come from dc bus 1. You must
have AC power on the airplane to power this bus.
When the fueling station door is open and ground power is
available, processor unit power can come from the 28v dc hot
battery bus. The battery supplies power to this bus. It is not
necessary to put the battery switch in the ON position for the
battery to power this bus.
When the fueling indication test switch is in the FUEL DOOR
BYPASS SWITCH position, processor unit power comes from
the 28v dc hot battery bus.
FUEL INDICATING - FUEL QUANTITY PROCESSOR UNIT - POWER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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FUEL INDICATING - FUEL QUANTITY PROCESSOR UNIT - POWER
FUEL INDICATING - FUEL QUANTITY PROCESSOR UNIT - POWER
EFFECTIVITY
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General
The fuel quantity processor unit (FQPU) has three signal
conditioner circuit cards (SCCC) and a BITE display card (BDC).
Fuel quantity shows on the common display system (CDS).
Signal Conditioner Circuit Cards
There is one SCCC for each fuel tank. Each SCCC has these
functions:
* Sends a low Z signal to the tank units and compensator
* Reads the high Z return signal from the tank units and
compensators
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* Sends an ac drive signal to the densitometer
* Reads the sense signal from the densitometer
* Calculates fuel density to improve system accuracy
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* Calculates total fuel weight for its tank
* Changes analog signals to ARINC 429 signals
* Sends tank fuel weight data to the DEUs
* Sends real time fault data to the BDC.
The tank 2 SCCC also sends total fuel tank weight to the FMC.
BITE Display Card
The BDC has these functions:
* Keep fault data in non-volatile memory
* Send a signal to each SCCC to start a real time test for fault
isolation
* Send and receives fault data with the flight management
computer for fault isolation.
FUEL INDICATING - PROCESSOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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FUEL INDICATING - PROCESSOR - FUNCTIONAL DESCRIPTION
FUEL INDICATING - PROCESSOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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FUEL INDICATING - PROCESSOR - FUNCTIONAL DESCRIPTION
FUEL INDICATING - PROCESSOR - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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FUEL INDICATING - PROCESSOR - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
Individual fuel tank quantity shows on the CDS and the refuel
panel.
Fuel quantity shows in pounds or kilograms.
Fuel Configuration Messages
Fuel configuration messages show on the CDS. These
messages show a problem with the configuration of the fuel
system.
The LOW message shows that either main tank 1 or main tank 2
has less than 2,000 lb (907 kg) of fuel. This message goes away
when there is more than 2,500 lb (1133 kg) of fuel in that tank.
The low fuel condition must exist for 30 seconds before the LOW
message shows.
The IMBAL message shows when there is a difference of 1,000
lb (453 kg) between main tank 1 and main tank 2. The message
goes away when the difference between tanks is 200 lb (90 kg)
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