曝光台 注意防骗
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all displays. For the same detected fault, the computers
will automatically display the self-test formats if the
parking brake is set.
Crosstalk Comparison
a) Each computer receives analog signals, and then filters, scales, and analyzes them. The results are sent to the other computer. The other computer receives the same analog signals, processes them in the same manner, and sends its own results back to the first computer. Each computer then compares the two values.
b) If both computers decide an analog signal is outside of the allowable range, or invalid, the corresponding section of the affected display page is blanked.
c) If one computer determines an analog signal is invalid, but the other determines the signal is valid, a fault condition exists. The EICAS computer that processed the invalid signal is shut down. The remaining computer displays the status message (L or R) EICAS CMPTR, as applicable.
d) If both computers process a valid analog signal, but yet they disagree on the final result, a fault exists. The fault could be in the wiring circuit between the two computers, or in the input receiving circuitry of either computers.
e) If the disagreement exists with an engine parameter, the status message EICAS DISAGREE and the maintenance message EICAS BITE are displayed. A decimal code, identified as ENGINE DISAGREE, is displayed on the BITE test format when the self test is run.
f) If the disagreement exists with a non-engine parameter or an analog discrete, only the maintenance message EICAS BITE is displayed. A decimal code is displayed on the test page as SUB-SYS DISAGREE or DISCRETE DISAGREE, as applicable.
g) The cross comparison of the discrete inputs is inhibited if the state of the comparison has changed since the previous comparison. Three consecutive cycles (20 seconds per cycle) are required to register a disagree code.
h) The disagree codes and their respective input pin numbers are listed in Table 101.
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MAINTENANCE MANUAL
6) The Maintenance message EICAS BITE will also be generated for any other BITE-detected faults not covered by other messages. These faults include failures in nonvolatile memories or other faults not affecting in-flight operation of the system.
7) Any fault detected during self-monitoring will set a fault bit in the CU MONITOR code, displayed on the BITE test page. This hexadecimal code readout provides data to the shop personnel for use in fault isolation of the LRU. If the CU MONITOR code displays all zeros, no faults were detected during self monitoring.
8) When a computer receives invalid data from a parameter that is not connected in parallel to the other computer (i.e., temperatures), the corresponding section of display will be blanked.
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