Controls and instrumentation Electronic indicating systems

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Electronic indicating systems 
54. Electronic  indicating  systems  consolidate engine indications, systems monitoring, and crew alerting functions onto one or more cathode ray tubes (C.R.T.'s) mounted in the instrument panel. The information is displayed on the screen in the form of dials with digital readout and warnings, cautions and advisory messages shown as text.

Fig. 12-12 Typical electronic indicating display.

55. Only those parameters required by the crew to set  and  monitor  engine  thrust  are  permanently displayed on the screen.  The system monitors the remaining parameters and displays them only if one or more exceed safe limitations.  The pilot can, however, override the system and elect to have all main parameters in view at any time (fig. 12-12).

56. Warnings, cautions and advisory messages are displayed only when necessary and are colour coded to communicate the urgency of the fault to the flight crew. Provision is made to record any event or out of tolerance parameter in a non-volatile memory for later evaluation by ground maintenance crews.
57. Electronic indicating systems offer improved flight  operations  by  reducing  the  pilot  workload through automatic monitoring of engine operation and  a  centralized  caution  and  warning  system. Reduced flight deck clutter is another feature as the multitude of instruments traditionally present are replaced by the C.R.T.'s.