Under 14 CFR § 107.29(b), during periods of civil twilight, a small unmanned aircraft must have —

Why: 14 CFR § 107.29(b) requires anti-collision lighting visible for at least 3 statute miles, with a flash rate sufficient to avoid a collision, during periods of civil twilight.

• The rule requires flashing anti-collision lighting, not a steady position light, and the visibility figure and light type given here do not match § 107.29(b).
• Civil twilight carries its own lighting requirement separate from daylight operations; it is not treated identically to full daylight under § 107.29.