"NA at Night" on instrument approaches means "Not Authorized" during civil twilight night, primarily due to unlit obstacles penetrating critical visual segments (20:1 slope) that pilots must be able to see.
Pilots are legally obligated under Part 91.175(a) to comply with "NA at Night" restrictions, regardless of whether ATC issues a clearance, as ATC is not responsible for pilot compliance with approach chart limitations.
When an approach is "NA at Night," pilots must select an authorized alternative, such as a different approach, diverting, or waiting until daylight, while carefully considering the increased risks of unlit obstacles in unfamiliar terrain.
You planned this getaway weekend to Wise County, Virginia months ago. A cabin is ready. A rental car awaits you when you land at Lonesome Pine airport (KLNP). It’s good to be instrument rated. The reported ceilings are comfortably high at 1500 AGL. It’s nice to have the protection of an instrument approach when going somewhere new, especially in the Appalachians.
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