The emergency lighting system will operate off its dedicated batteries for up to how many minutes?

• A. 5 minutes
• B. 15 minutes
• C. 30 minutes
• D. 10 minutes

Answer: (D)

The test is checking understanding of how emergency lighting is designed to function after a power loss. Emergency lighting runs on its own dedicated batteries so that illumination remains available even if the aircraft’s main electrical system fails. The purpose is to give passengers enough light to see exits and follow the safety path during an evacuation. Regulatory requirements specify a minimum duration for this backup lighting, which is ten minutes. So the best answer is ten minutes because it matches the standard minimum duration that emergency lighting must cover. Shorter durations, like five minutes, wouldn’t meet the required evacuation time, while longer durations, such as fifteen or thirty minutes, go beyond the minimum standard (and some systems may be longer in different configurations, but the question targets the standard requirement).