Plain English Meaning
A warning or status light on the instrument panel that turns on to tell the pilot something — for example, that a system is running, has failed, or needs attention.
Full Definition
A small indicator light on the cockpit panel that illuminates to alert the pilot to the status of a specific system or condition, such as a system being active, a fault being present, or a limit being approached. Annunciator lights are typically color-coded — red for warnings requiring immediate action, amber for cautions, and green or white for advisory or status information.
Context Anchor
Seen on the instrument panel or system control panel, including panels for and equipment.