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CA.I.C.K3iFAA-S-ACS-7B · Nov 2023Knowledge

i. Icing and freezing level information

ACS element text (the applicant demonstrates understanding of)

Meteorology applicable to the departure, en route, alternate, and destination under visual flight rules (VFR) in Visual Meteorological Conditions (VMC), including expected climate and hazardous conditions such as: i. Icing and freezing level information

Bottom line

Under 14 CFR 91.527(b), no pilot may fly under VFR into known light or moderate icing conditions unless the aircraft meets stated equipment or certification requirements. AIRMET Zulu is the advisory code used to denote icing and freezing levels.

Key numbers

Key numbers for i. Icing and freezing level information
NumberWhat it means
Known light or moderate icing (VFR)VFR icing ban
Known or forecast severe icingSevere icing
Icing and freezing levelsAIRMET Zulu
Moderate icing forecastAIRMET content

FAA references

  1. 14 CFR 91.527 (Operating in icing conditions.) — eCFR current as of 2026-03-05
  2. PHAK ch. 13 (p. 13-11) — FAA-H-8083-25C (2023)
  3. AC 91-92 Appendix A — AC No: 91-92
  4. AC 91-92, paras. 7.7, 8.2 — AC No: 91-92
  5. AFH ch. 5, Environmental Factors (p. 5-2) — FAA-H-8083-3C
  6. AFH ch. 13 (pp. 13-9–13-10) — FAA-H-8083-3C
  7. AWH ch. 3 (p. 3-3) — FAA-H-8083-28A
  8. RMH ch. 5 (p. 5-2) — FAA-H-8083-2A
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