SkyDrill

End of evening civil twilight lighting period

Remote Pilot (Part 107) practice question 4 of 19 on Operations / Emergency Procedures. ACS element UA.V.C.K7 · 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 7:14 p.m. local time. Under § 107.29, until what time does the evening civil twilight period, during which lighted anti-collision lighting is required, extend?

  1. A8:14 p.m.
  2. B7:14 p.m.; civil twilight ends at official sunset
  3. C7:44 p.m.
Show the answer and explanation

Correct answer: C. 7:44 p.m.

  • A — incorrect The civil twilight period lasts 30 minutes after official sunset, not 60 minutes.
  • B — incorrect Evening civil twilight begins, rather than ends, at official sunset under § 107.29(c)(2).
  • C — correct § 107.29(c)(2) defines evening civil twilight outside Alaska as beginning at official sunset and ending 30 minutes after official sunset; 7:14 p.m. plus 30 minutes is 7:44 p.m.

BACKGROUND

Section 107.29(b) requires lighted anti-collision lighting visible for at least 3 statute miles during periods of civil twilight. Paragraph (c) defines civil twilight for the purposes of that rule. Outside Alaska, morning civil twilight begins 30 minutes before official sunrise and ends at official sunrise, and evening civil twilight begins at official sunset and ends 30 minutes after official sunset. In Alaska, civil twilight is the period defined in the Air Almanac. With a 7:14 p.m. sunset, the evening period runs from 7:14 p.m. to 7:44 p.m. After that, the operation is at night and the additional night requirements of § 107.29(a) apply, including the same anti-collision lighting.

STUDY TIP

Compute civil twilight as 30 minutes on the dark side of official sunrise and sunset, and remember that Alaska uses the Air Almanac definition instead.

KEY POINTS

  • Evening civil twilight runs from official sunset to 30 minutes after sunset outside Alaska.
  • Morning civil twilight runs from 30 minutes before official sunrise to sunrise.
  • Anti-collision lighting visible for 3 statute miles is required throughout civil twilight.

SOURCES

  • 14 CFR 107.29(b)
  • 14 CFR 107.29(c)
Practice the Remote Pilot (Part 107) test →Timed 60-question exam, by ACS area, or review your misses. Free.
MORE ON OPERATIONS / EMERGENCY PROCEDURES

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.