757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 2(12)

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 G.  Discrete warning and caution lights provide back-up for EICAS displays and messages. In addition, the standby engine indicator will provide primary engine thrust information if both computers or both display units fail.
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MAINTENANCE MANUAL

PILOT DISPLAY SELECT PANEL

1 GUN 051
EICAS Simplified Block DiagramFigure 1
D01605
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MAINTENANCE MANUAL

 H. Configuration
 (1)  
EICAS Computer

 (a) The -1001 EICAS computer is installed on all airplanes.

 (2)  
EICAS DISPLAY select panel

 (a)  The -206 EICAS DISPLAY Select Panel is basic.
 2. Component Details (Fig. 2)
_________________
 A. EICAS Computers
 (1)  
Each EICAS computer receives inputs in the form of both analog signals and ARINC 429 digital data words. These inputs are processed and formulated into various display formats for presentation of engine, status, and maintenance data.

 (2)  
Each computer also receives analog discrete inputs for the generation of EICAS messages. These messages are processed and included in the proper fomats for display.

 (3)  
Each computer has program pins for selection of display options. These options reflect customer requirements and the type and model of engines.

 (4)  
Each EICAS computer receives control input data from the EICAS display select panel. The computer uses this data to determine the desired mode of operation. The proper display format is then selected for display.

 (5)  
The EICAS computers assemble data from their analog and digital inputs and from internal programming into analog output signals. These analog outputs are used to drive the video display units.

 (6)  
The computers incorporate BITE for self checks and to monitor overall system health. Digital input words are checked for presence and validity. In addition, all data processed by each computer is sent to the other computer over high speed crosstalk data buses. This allows cross comparison of analog signals received by both computers to determine if their processed values are valid, invalid, or disagree between computers. A test mode can also be initiated manually by pressing a TEST button in the flight deck. This test mode processes signals through the computers and checks the results. The test also monitors for system LRU fail discretes, and displays the test results on the EICAS display units.

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