(b)
Each of the two Input/Output Channel (IOC) circuit boards adds the fuel quantity data. The IOC circuit boards also send fuel quantity data, through the ARINC busses A and B, to the fuel quantity indicator module, load select indicators, EICAS and FMC. The IOC, through the BITE circuit card, sends control signals to close the fueling shutoff valves at Volumetric Top Off (VTO) or at the load select quantity. The IOC circuit cards also supply outputs for low fuel and fuel configuration indication. They also receive inputs for the fueling station door position, air/ground relay position, system test, indicator tests, load select set data and fuel override pump status.
(c)
The BITE circuit card keeps FQIS faults and has an interface with the BITE controls on the front face of the processor to show the faults. The drivers for the fueling shutoff valves are found on the BITE circuit card. The BITE circuit card has ARINC bus C which transmits fuel system information and fuel quantity data from the IOC's to the EICAS for message logic.
(5)
The processor receives signals from the tanks units, compensators, densitometers, load select control, and air/ground relay, and performs computations as programmed. Output signals of fuel quantity go to the fuel quantity indicator module, and the load select indicators. A signal is also sent to the EICAS computers and FUEL CONFIG light on P5, warning of low fuel, fuel imbalance, or system faults. Fueling valve control signals are available during the fueling operation. The processor also provides failure monitoring, and built-in-test.
(6)
The six buttons on the front face of the processor operate as follows:
(a)
ON/OFF button - causes the BITE display control come on or go off.
(b)
MENU button - goes to the menu level and shows different menus.
(c)
YES button - goes to the menu item shown on the display.
(d)
NO button - goes to the next menu item on the display.
(e)
The UP arrow button - shows the last data item shown.
(f)
The DOWN arrow button - shows the next data item.
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A
757
MAINTENANCE MANUAL
I. Tank Wiring Harness (Fig. 9 and 10)
(1)
The location of the tank wiring harnesses are shown in Fig. 9.
(2)
The breakdown between the airplane wiring harnesses and the tank wiring harnesses for the left main fuel tank are shown in Fig. 9 (Sheet 3).
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