Operate Runway Edge Lights between Sunset and Sunrise for Arriving IFR Aircraft ______.

• A. Before the Aircraft Is Estimated Over the Outer Marker (OM)
• B. When You Receive the Inbound
• C. When Requested by the Pilot
• D. Before the Aircraft Begins Final Approach

Answer: (D)

The important idea here is that runway lighting should be available to guide the aircraft as it transitions to its final approach, especially during night or low-visibility conditions. Runway edge lights define the runway boundaries and give pilots crucial visual cues for alignment and glide path. Turning them on before the aircraft begins final approach ensures those cues are visible as the descent begins, helping the pilot establish correct touchdown alignment and maintain situational awareness throughout the approach.

Waiting to turn them on until the aircraft is inbound, over an older fix, or only at pilot request can leave the pilot with insufficient visual reference during the critical final approach phase. By having the edge lights illuminated before the final approach starts, you provide the necessary runway outline early enough for a safe, controlled arrival.