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Evening civil twilight end time

Remote Pilot (Part 107) practice question 3 of 34 on Regulations / Operating Rules. ACS element UA.I.B.K24 · difficulty: applied. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONOutside Alaska, official sunset is at 7:00 p.m. local time. Under § 107.29, at what time does the evening period of civil twilight end, during which a small unmanned aircraft must have anti-collision lighting visible for at least 3 statute miles?

  1. A8:00 p.m., one hour after sunset
  2. B6:30 p.m., since civil twilight precedes sunset
  3. C7:30 p.m.
Show the answer and explanation

Correct answer: C. 7:30 p.m.

  • A — incorrect The period in § 107.29(c)(2) lasts 30 minutes after official sunset, not one hour.
  • B — incorrect Evening civil twilight begins at official sunset, not before it; the period that begins before an event is morning civil twilight, which starts 30 minutes before official sunrise.
  • C — correct § 107.29(c)(2) defines evening civil twilight outside Alaska as the period that begins at official sunset and ends 30 minutes after official sunset; 30 minutes after 7:00 p.m. is 7:30 p.m.

BACKGROUND

Section 107.29 of 14 CFR part 107 governs operation at night and during civil twilight. Paragraph (b) prohibits operating during civil twilight unless the small unmanned aircraft has lighted anti-collision lighting visible for at least 3 statute miles with a flash rate sufficient to avoid a collision. Paragraph (c) defines civil twilight for this purpose: outside Alaska, the period beginning 30 minutes before official sunrise and ending at official sunrise, and the period beginning at official sunset and ending 30 minutes after official sunset. In Alaska, civil twilight is the period defined in the Air Almanac. The remote pilot in command may reduce the intensity of the anti-collision lighting for safety but may not extinguish it.

STUDY TIP

Work civil twilight problems as simple arithmetic: 30 minutes before sunrise, and 30 minutes after sunset, except in Alaska where the Air Almanac governs.

KEY POINTS

  • § 107.29(c): civil twilight outside Alaska is 30 minutes before sunrise to sunrise, and sunset to 30 minutes after sunset.
  • In Alaska, civil twilight is as defined in the Air Almanac.
  • During civil twilight the aircraft needs anti-collision lighting visible for at least 3 statute miles.

SOURCES

  • 14 CFR 107.29(b)
  • 14 CFR 107.29(c)
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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.