Operate the Runway Edge Lights between Sunrise and Sunset when Surface Visibility is less than ______ mile(s).

Operate the Runway Edge Lights between Sunrise and Sunset when Surface Visibility is less than ______ mile(s).

• A. 4
• B. 3
• C. 2
• D. 1

Answer: (C)

Daylight runway edge lighting is used to define the runway boundaries when visibility is reduced. Between sunrise and sunset, operate the runway edge lights when surface visibility is less than two miles. This threshold helps pilots see the edges of the runway in low-visibility daytime conditions, improving situational awareness during approaches and takeoffs. Values like four or three miles would turn on lighting even when visibility isn’t that reduced, and one mile is more restrictive than needed for daytime operations, so two miles is the correct standard.

Daylight runway edge lighting is used to define the runway boundaries when visibility is reduced. Between sunrise and sunset, operate the runway edge lights when surface visibility is less than two miles. This threshold helps pilots see the edges of the runway in low-visibility daytime conditions, improving situational awareness during approaches and takeoffs. Values like four or three miles would turn on lighting even when visibility isn’t that reduced, and one mile is more restrictive than needed for daytime operations, so two miles is the correct standard.