For arriving IFR aircraft, which statement about runway edge lights is true?

• A. before the aircraft is estimated over the Outer Marker (OM)
• B. before the aircraft begins final approach
• C. when inbound
• D. when requested by the pilot

Answer: (B)

Runway edge lights provide visual boundary cues that help a pilot identify and align with the runway during instrument approaches, especially in reduced visibility. Having these lights on before the final approach begins ensures the pilot can see the runway edges as soon as they start to establish the approach, aiding situational awareness and a smoother transition to landing.

Turning the lights on before final approach gives the boundary definition in the critical early approach phase, rather than waiting until later or only after a specific request. Lights that come on only as you inbound or only when requested may leave the pilot without adequate runway edge cues during the initial and intermediate approach segments, which can compromise safe alignment and descent.