(3)
To test the load select indicators, push the TEST IND switch on the fueling control panel, P28. The top and bottom displays should show
888.8.
(a) The TEST IND switch also does a test of the two ARINC buses A and B. The LSI gets the fuel quantity information from one of the two ARINC busses A and B. If one or two of the ARINC busses is inactive, "-A.-", "-b.-" or "-A.b" will show on the displays of the LSI before the displays show the quantity of usable fuel in the fuel tanks if only one bus is bad. If both busses are bad "-A.b" will show and then the displays will blank.
THE UNITS ARE IN LBS OR KGS.
Load Select Indicator (LSI) Figure 6
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MAINTENANCE MANUAL
(4)
If during the fueling operation there is a FQIS failure, the load select indicator will show the message PUSH SET and the fuel shutoff valve will close. To continue fueling, you must push the set button and fuel manually without the automatic fuel shutoff capability. If fuel quantity indication is available, it is possible that it is not accurate. To continue automatic fueling, you must correct the failure by doing the Fuel Quantity Bite "SELF TEST?" and corrective action (FIM 28-41-00/101).
G.
Load Select Control Unit (Fig. 7)
(1)
The load select control unit is found on the fueling control panel, P28.
(2)
The load select control unit is a hermetically sealed unit. The case houses three thumbwheel type switches, three resistor boards, and an electrical connector.
(3)
The load select control unit lets the fueling crew select the quantity of fuel to be put into each fuel tank. To do this you set the thumbwheel switches then push the SET switch for the applicable fuel tank. The processor (FQPU) reads the resistance set at the load select control unit to determine the fuel quantity to be loaded.
H.
Fuel Quantity Processor Unit (FQPU) (Fig. 8)
___________________________________
(1)
The fuel quantity processor unit (referred to as "the processor") is the principle component of the fuel quantity indicating system. The processor calculates fuel quantity and sends the data for display in the flight compartment and at the fueling control panel, P28. The processor also controls the pressure fueling operations and does BITE functions.
(2)
The processor is found in the main equipment center on the E3-4 shelf. There are connectors on the front face of the processor for the ARINC channels A, B and C. The connectors, found at the back of the processor, connect it with the other components of the FQIS. On the front face of the processor are a 32 character LED display, a BIT procedure placard, a MENU button, a YES button, a NO button, an ON/OFF button and UP and DOWN arrow buttons.
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