As shown in the wiring diagram of the semi-automatic navigation lighting panel circuit, what would cause the buzzer to sound and for the indicator light to illuminate in the line section for a particular navigation running light? Illustration EL-0108

Correct Answer: Option A — a burned out navigation light in effected line section

Navigation light failure monitors use current-sensing relays in series with each lamp. A burned-out running light opens the current path, de-energizing the monitoring relay, closing the alarm contacts to sound the buzzer, and illuminating the fault indicator.