VFR · Lesson 37 · 8 min · ACS PA.III.A · ACS PA.I.E
Frequencies, Clearances and Readbacks
Summary
Pick the frequency for the phase of flight (CTAF, UNICOM, ground, tower, approach). Understand every clearance, read back hold-short and runway instructions, and say "unable" when you cannot comply.
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Frequency types · Topic mastery: Not started
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What is the CTAF used for?
Why this matters in flight
Talking to the right facility on the right frequency, and reading back the instructions that matter, is how you stay coordinated with ATC and other traffic. A missed hold-short readback is a classic setup for a runway incursion.
Each frequency has a job. CTAF is where you self-announce at non-towered airports, and UNICOM is a nongovernment station that may pass advisory information like the active runway and wind. At a towered field, ground control gives taxi instructions, tower handles the runway for takeoff and landing, and approach or departure control provides radar service in the surrounding airspace. An ATC clearance authorizes you to proceed under stated conditions, and you must understand it before acting. Some instructions must be read back so the controller can confirm you heard them correctly — above all, hold-short instructions and any instruction to enter, cross, or hold on a runway — and the readback ends with your call sign. A clearance is never an order to do something unsafe: if you cannot comply you say "unable" and ask for an alternative.
Key terms
- CTAF
- Common traffic advisory frequency for self-announcing at non-towered airports.
- UNICOM
- A nongovernment advisory station that may report runway and wind.
- Readback
- Repeating key clearance elements so the controller can catch an error.
Sources & references · 3 · 3 linked
Every claim traces to a source — paraphrased knowledge elements pointing at the governing FAA publication. Items marked verified have been checked against the retrieved source text; the rest are pending verification. Where the exact page or regulation has been located in a retrieved document, the source links straight to it.
- AIM 4-1 — Aeronautical Information Manual verifiedAIM 4-1 (p. 199)
- AIM 4-4 — Aeronautical Information Manual verifiedAIM 4-4 (p. 271)
- FAA-H-8083-25 (communications) — Pilot’s Handbook of Aeronautical Knowledge verifiedPilot’s Handbook (document)
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