Is the emergency lighting system automatically activated when normal aircraft power is lost?

Is the emergency lighting system automatically activated when normal aircraft power is lost?

• A. Yes
• B. No
• C. Only after crew action
• D. Only in certain configurations

Answer: (A)

Emergency lighting is built to come on automatically when normal aircraft power is lost. It has its own independent power source (such as batteries or a dedicated emergency generator) and a detector/transfer mechanism that switches the lights to emergency power the moment main power fails. This automatic activation ensures passengers can clearly see exits and follow escape routes without waiting for crew action, which is crucial for a safe evacuation. While maintenance or testing scenarios can alter behavior temporarily, in normal operation the system activates automatically, not requiring crew intervention.

Emergency lighting is built to come on automatically when normal aircraft power is lost. It has its own independent power source (such as batteries or a dedicated emergency generator) and a detector/transfer mechanism that switches the lights to emergency power the moment main power fails. This automatic activation ensures passengers can clearly see exits and follow escape routes without waiting for crew action, which is crucial for a safe evacuation. While maintenance or testing scenarios can alter behavior temporarily, in normal operation the system activates automatically, not requiring crew intervention.