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Warnings of information failure on the EADI and EHSI are displayed…

  • A

    In amber, at the position of the missing information.

  • B

    In amber, at the top left of the screen.

  • C

    In flashing yellow at the screen centre.

  • D

    In red, at the position of the missing information.

Refer to figure.
The Electronic Flight Instrument System (EFIS) replaces mechanical instruments in modern helicopters.

A complete EFIS installation consists of a left and right system, one for each Pilot. The major parts of a typical EFIS system may be the following:

  • Display units (DU): PFD, MFD, EADI or EHSI.
  • Control panels.
  • System processors.
  • Symbol generators.
  • Other linked systems.

EFIS systems have two main failure modes:

  • An entire DU may fail, in which case the remaining screens can be reconfigured to show critical data.
  • Sources may fail, in which case all the DUs relying on that source will either show a failure flag or remove that part of the display entirely.

In the attached figure, the radio altimeter has failed, so the entire rad alt display is removed from the screen, replaced by a yellow/amber box and a RA flag.

NOTE:

A typical EFIS system comprises a Primary Flight Display (PFD) (Electronic Attitude Direction Indicator (EADI)) and an Electronic Horizontal Situation Indicator (EHSI) (Navigation Display).

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