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Lighting during evening civil twilight

Remote Pilot (Part 107) practice question 15 of 31 on Airspace / Operational Requirements. ACS element UA.II.B.K10 · difficulty: applied. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONOfficial sunset at a location outside Alaska is 6:52 p.m. A remote pilot plans to fly from 7:00 p.m. to 7:15 p.m. Under § 107.29, is anti-collision lighting required?

  1. ANo, because lighting is required only at night, after civil twilight ends at 7:22 p.m.
  2. BYes, because the flight falls within civil twilight, which ends at 7:22 p.m.
  3. CNo, because the flight ends before 7:52 p.m., one hour after sunset
Show the answer and explanation

Correct answer: B. Yes, because the flight falls within civil twilight, which ends at 7:22 p.m.

  • A — incorrect Lighting is required during civil twilight itself under § 107.29(b), not only at night after it ends.
  • B — correct § 107.29(c)(2) makes civil twilight run from official sunset (6:52 p.m.) to 30 minutes later (7:22 p.m.), and § 107.29(b) requires anti-collision lighting visible for 3 statute miles during that period.
  • C — incorrect The regulation defines civil twilight using 30 minutes after sunset, and lighting is required during that period; no one-hour figure exists.

BACKGROUND

Section 107.29(b) prohibits operating a small unmanned aircraft system during periods of civil twilight unless the aircraft has lighted anti-collision lighting visible for at least 3 statute miles with a flash rate sufficient to avoid a collision. Paragraph (c)(2) defines evening civil twilight outside Alaska as the period beginning at official sunset and ending 30 minutes after official sunset. To apply the rule, the remote pilot adds 30 minutes to the official sunset time and checks whether any part of the flight falls within that window. Any flight time after the window ends is night, which carries the additional training requirement in paragraph (a)(1).

STUDY TIP

When a scenario gives a sunset time, add 30 minutes to find the end of civil twilight and check the flight times against it.

KEY POINTS

  • Evening civil twilight = official sunset plus 30 minutes (outside Alaska).
  • Anti-collision lighting visible 3 statute miles is required during civil twilight.
  • Flight after that window is night operation with additional requirements.

SOURCES

  • 14 CFR 107.29(b)
  • 14 CFR 107.29(c)(2)
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SkyDrill is not affiliated with the FAA. This is an original practice item based on 14 CFR part 107, 14 CFR part 89, and the FAA Remote Pilot – Small UAS Study Guide (FAA-G-8082-22). Regulations and handbooks are revised; confirm details against the current edition.