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Dictionary Meaning and Definition on 'Annunciator'

Annunciator Meaning and Definition from WordNet (r) 2.0
    annunciator n : an indicator that announces which electrical circuit has been active (as on a telephone switchboard)
Annunciator Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Annunciator \An*nun"ci*a`tor\, n. [L. annuntiator.]
  1. One who announces. Specifically: An officer in the church of Constantinople, whose business it was to inform the people of the festivals to be celebrated.
  2. An indicator (as in a hotel) which designates the room where attendance is wanted.
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Wikipedia Meaning and Definition on 'Annunciator'

An annunciator panel is a group of lights used as a central indicator of status of equipment or systems in an aircraft, industrial process, building or other installation. Usually the annunciator panel includes a main warning lamp or audible signal to draw the attention of operating personnel to the annunciator panel for abnormal events or conditions.

In the aircraft industry, annunciator panels are groupings of annunciator lights that indicate status of the aircraft's subsystems. The lights are usually accompanied with a test switch, which when pressed illuminates all the lights to confirm they are in working order. More advanced modern aircraft replaces these with the integrated electronic Engine Indicating and Crew Alerting System or Electronic Centralised Aircraft Monitor.

On this aircraft overhead panel, the pilot is pressing the test switch. You can also see how the lights are grouped together with their associated systems into various panels of lights.

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