(3)
The processor needs 28 volts dc power to operate.
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MAINTENANCE MANUAL
TEST
OFF OFF OFF rr FUEL FUEL FUEL
IND SYSTEM
OPEN OPEN
b bb b
rr
TEST RESET
FUELING CONTROL OVERFILL
SETr SETr SETr
PANEL, P28
LOAD SELECTRIGHT MAIN CENTER LEFT MAIN
SEE A
FUEL QTY FUEL QTY FUEL QTY
0 0 0
X 1000 X 1000 X 1000
111
QTY X 1000
LOAD SELECT LOAD SELECT LOAD SELECT
B DEFUEL LH
LOAD SELECT DEFUEL RH
RIGHT WING FO
A CLOSE
INDICATOR CLOSE
F T
bb
P
OPEN O W OPEN OPENOPEN N R
LOAD SELECT CONTROL SEE B
FUELING CONTROL PANEL, P28 A
THUMBWHEEL SWITCH (EXAMPLE)
LOAD SELECT CONTROL
LOAD SELECT CONTROL
B
1THE UNITS ARE IN LBS OR KGS.
Load Select Indicator (LSI) Figure 7
A08369
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MAINTENANCE MANUAL
FUEL QUANTITY PROCESSOR UNIT (E3-4)
SEE A
MAIN EQUIPMENT CENTER
FUEL QUANTITY PROCESSOR UNIT A
Fuel Quantity Processor Unit (FQPU)
Figure 8
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MAINTENANCE MANUAL
(4)
Two separate and redundant power supplies supply each of the six circuit boards. Only one power supply is necessary for normal operation. The circuit boards are electrically and physically separated. During normal operation all the circuit boards have power.
(a)
Each Individual Fuel Quantity Channel (IFQC) circuit board is assigned to one fuel tank. If a component is bad or there is contamination in one fuel tank, it does not affect the other fuel tanks. The IFQC circuit boards supply excitation signals to the tank units, compensators and densitometers. The IFQC circuit boards also measure the return signals and calculate fuel weight and density. The fuel quantity, built-in-test, and other calculated information for each fuel tank is sent through a redundant serial data bus to each Input/Output Channel (IOC) circuit board internal to the processor.
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