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A
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MAINTENANCE MANUAL
CARD LOCATION PLACARD
FUEL SYSTEM CARD FILE
SEE A
PRINTED CIRCUIT CARDS
NOTE:____ CIRCUIT CARD. OF EACH TYPE OF PRINTED PLACARD FOR EXACT POSITION REFER TO CARD LOCATION A
Fuel System Card File Location Figure 4
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MAINTENANCE MANUAL
D. Operation of the cards can be checked by initiating the appropriate CMC BITE, called up from any CDU.
E. The fuel system card file access panel test points are used for accessing the ARINC data bus and for activating the power-up ground bite tests for the cards. The points HI, LO, and SHIELD are outputs for the ARINC data bus analyzer. The points FSMC A, FSMC B, FJCC A, FJCC B, and FSEIC are bite inputs to the cards. Grounding the test points activates the power-up ground bite test for the cards.
17. Fuel System/EICAS Interface Cards (FSEIC)
_________________________________________
A. The fuel system/EICAS interface cards (FSEIC) provide the communication link between the CMCS and EICAS, and the fuel system.
B. Each FSEIC is a single-board printed circuit assembly installed in a slot in the fuel system card file. The card is retained in the card file by two lever locks and two captive screws that thread into holes in the card file. The card is easily replaced - no special tools are required. Two identical cards are installed in the fuel system card file at file positions 14 and 15. The function of each card is determined by the pin configuration of the card file connector.
C. The FSEIC have the following primary functions:
(1)
The FSEIC receive analog discrete inputs from the valve and pump control switches on the fuel management control module, from the valve position logic cards, and from the other fuel system control cards. The FSEIC convert these inputs into digital format that is output to EICAS on the ARINC 429 data bus. The data is used to develop the EICAS fuel synoptic.
(2)
The FSEIC receive digital BITE commands from the CMCS on the ARINC 429 data bus. The commands are converted into analog discrete BITE commands that are output to the FSMC, fuel jettison control cards (FJCC), or single point sensor (SPS) cards to initiate testing.
(3)
Internal logic in the FSEIC determines if any of the fuel system valves failed to open when commanded or if the APU fuel boost pump failed to operate when commanded. The appropriate bit in the digital data transmission from the card to EICAS is switched, indicating non-operation. The fault is annunciated as a CMCS message.
(4)
The main FSEIC determines fuel temperature and transmits temperature data on the ARINC 429 data bus for display on the EICAS main screen. For information on the fuel temperature system, refer to 28-43-00/001, Fuel Temperature Indicating System.
D.
The function of the FSEIC is shared between the two cards. The card in file position 14 is designated as the main card and the card in file position 15 is designated as the slave card. Information received by the slave card is converted into digital format and transmitted to the main card.
E.
In the event of slave FSEIC failure, the crossfeed valves will show closed on the EICAS fuel synoptic. In the event of main FSEIC failure, EICAS will not display fuel temperature or messages for non-operation and fuel system BITE will not occur.
18. Valve Position Logic Card (VPLC)
________________________________
A. The valve position logic cards (VPLC) provide position indication of the fuel system shutoff valves for the FSMC and FSEIC.
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