When will the Emergency Lights come on automatically?

When will the Emergency Lights come on automatically?

• A. When switch is in ON
• B. When switch is in AUTO and loss of AC or DC Power
• C. When power is restored
• D. When the cabin is depressurized

Answer: (B)

Automatic activation of the emergency lighting happens when the switch is in AUTO and there is a loss of AC or DC power. In this position, a sensing circuit detects the power failure and switches the emergency lighting to its emergency power source, illuminating the cabin and floor path to guide passengers to exits. If the switch is left ON, the lights stay on regardless of power status; if OFF, they do not activate automatically. Depressurization does not trigger the emergency lighting.

Automatic activation of the emergency lighting happens when the switch is in AUTO and there is a loss of AC or DC power. In this position, a sensing circuit detects the power failure and switches the emergency lighting to its emergency power source, illuminating the cabin and floor path to guide passengers to exits. If the switch is left ON, the lights stay on regardless of power status; if OFF, they do not activate automatically. Depressurization does not trigger the emergency lighting.