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AI.VI.A.K2FAA-S-ACS-25 · Nov 2023Knowledge

Proper radio communication procedures and air traffic control (ATC) phraseology.

ACS element text (the applicant demonstrates understanding of)

Proper radio communication procedures and air traffic control (ATC) phraseology.

Bottom line

Pilots operating from a towered airport are required to maintain two-way radio communication with ATC and to acknowledge and comply with their instructions.

FAA references

  1. PHAK ch. 14 (p. 14-2) — FAA-H-8083-25C (2023)
  2. 14 CFR 91.129 (Operations in Class D airspace.) — eCFR current as of 2026-03-05
  3. PHAK ch. 14 (p. 14-23) — FAA-H-8083-25C (2023)
  4. AIM 4-3-13 (Traffic Control Light Signals) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  5. RMH ch. 3 (p. 3-4) — FAA-H-8083-2A
  6. RMH ch. 6 (pp. 6-3–6-4) — FAA-H-8083-2A
  7. AFH ch. 1 (p. 1-12) — FAA-H-8083-3C
  8. AIM 11-8-2 (UAS Operations and Air Traffic Control (ATC)) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
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