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Frequency types that can serve as CTAF

Remote Pilot (Part 107) practice question 4 of 15 on Operations / Radio Communications. ACS element UA.V.A.K2 · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONAccording to the Remote Pilot Study Guide, which types of frequency may serve as the CTAF at a particular airport?

  1. AA UNICOM, MULTICOM, FSS, or tower frequency
  2. BOnly a UNICOM frequency, which is always 122.8
  3. COnly the MULTICOM frequency of 122.9
Show the answer and explanation

Correct answer: A. A UNICOM, MULTICOM, FSS, or tower frequency

  • A — correct The study guide states that the CTAF may be a UNICOM, MULTICOM, FSS, or tower frequency and is identified in appropriate aeronautical publications.
  • B — incorrect UNICOM is one possible CTAF, and 122.8 is only the usual UNICOM frequency; the guide lists three other frequency types that can also serve as CTAF.
  • C — incorrect MULTICOM 122.9 is used when an airport has no FSS or UNICOM; it is one of several frequency types that can be the CTAF, not the only one.

BACKGROUND

A CTAF is a frequency designated for airport advisory practices at an airport without an operating control tower. The study guide explains that the CTAF may be a UNICOM, MULTICOM, flight service station (FSS), or tower frequency. Which one applies at a given airport is identified in the appropriate aeronautical publications, such as the sectional chart or the Chart Supplement U.S. A remote pilot should identify the correct frequency as the first step in radio procedures before operating near a non-towered airport.

STUDY TIP

Remember the four-item list (UNICOM, MULTICOM, FSS, tower) and that the specific frequency is always found in the publications, never assumed.

KEY POINTS

  • The CTAF may be a UNICOM, MULTICOM, FSS, or tower frequency.
  • The applicable frequency is identified in aeronautical publications.
  • Identifying the frequency is the first step in radio procedures near a non-towered airport.

SOURCES

  • remote_pilot_study_guide.txt ch7 "Understanding Communication on a Common Frequency"
  • remote_pilot_study_guide.txt ch7 "Recommended Traffic Advisory Practices"
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MORE ON OPERATIONS / RADIO COMMUNICATIONS

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.