88.8.
 J. Load Select Control (Fig. 9)
___________________
 (1)  
The load select control is found on the fueling control panel, P28.

 (2)  
The load select control consists of an explosionproof case with a flame arrestor type breathing plug. The case houses three thumbwheel type switches, three resistor boards, and an electrical connector.

RIGHT WING
LOAD SELECT INDICATOR
THE UNITS ARE IN LBS OR KGS.

Load Select Indicator
Figure 8

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RIGHT WING
CONTROL SEE
B FUELING CONTROL PANEL, P28

BREATHER PLUG
LOAD SELECT CONTROL

THE UNITS ARE IN LBS OR KGS.

Load Select Control
Figure 9

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 (3)  
The load select control lets the fueling crew to select the quantity of fuel to be loaded into each individual fuel tank. This is accomplished by setting the thumbwheel switches then pushing the SET switch for the required tank. The load select control then sends an analog signal to the FQPU representive of the fuel to be loaded.

 K.
Fuel Quantity Processor Unit (FQPU) (Fig. 10)

___________________________________
 (1)  
The fuel quantity processor unit (FQPU, also referred to as the "processor") is a digital, dual channel computer. Memory provisions include; read only memory (ROM) for storing the programs, random access memory (RAM) for scratchpad functions, and electrically alterable read only memory (EAROM) for storing faults. All input/output ports on the FQPU are memory mapped.

 (2)  
The FQPU requires 50 watts of power at 28 volts dc.

 (3)  
The FQPU is installed on the E3-4 shelf in the main equipment center. Two hold-down hooks at the front of the FQPU secure the unit on the rack. An ARINC 600-1 style 2 connector, located at the back of the FQPU, connects it with the other components of the FQIS. On the front panel of the FQPU are controls for the built-in test, and a red dot (light emitting diode) matrix, fault and status code display.
　
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