CA.I.E.S2FAA-S-ACS-7B · Nov 2023Skills
Correctly identify airspace and operate in accordance with associated communication and...
Correctly identify airspace and operate in accordance with associated communication and equipment requirements.
Bottom line
Regardless of weather conditions, an ATC clearance is required prior to operating within Class B airspace. Unless otherwise authorized, each aircraft must establish two-way radio communications with the ATC facility providing air traffic services prior to entering the airspace and thereafter maintain those communications while in the airspace. Two-way radio communication must be established with the ATC facility providing ATC services prior to entry and thereafter maintain those communications while in Class C airspace.
FAA references
- 14 CFR 91.135 (Operations in Class A airspace.) — eCFR current as of 2026-03-05
- AIM 3-2-3 (Class B Airspace) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- PHAK ch. 15 (p. 15-2) — FAA-H-8083-25C (2023)
- AIM 3-2-4 (Class C Airspace) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- AIM 3-2-5 (Class D Airspace) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- 14 CFR 91.117 (Aircraft speed.) — eCFR current as of 2026-03-05
- 14 CFR 91.130 (Operations in Class C airspace.) — eCFR current as of 2026-03-05
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