FlyCurrentFLYCURRENT
IR.I.B.K3iFAA-S-ACS-8C · 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 for flights conducted under Instrument Flight Rules (IFR) to include expected climate and hazardous conditions such as: i. Icing and freezing level information

Bottom line

No pilot may fly under IFR into known or forecast light or moderate icing conditions unless the aircraft meets one of the listed exceptions.

Key numbers

Key numbers for i. Icing and freezing level information
NumberWhat it means
moderate icingAIRMET icing
ZuluIcing AIRMET code

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. AFH ch. 13 (pp. 13-9–13-10) — FAA-H-8083-3C
  5. PHAK ch. 13 (p. 13-5) — FAA-H-8083-25C (2023)
  6. RMH ch. 5 (p. 5-2) — FAA-H-8083-2A
  7. AWH ch. 3 (p. 3-3) — FAA-H-8083-28A
  8. AC 91-92, para. 7.4.1.1 — AC No: 91-92
Members lesson

Build understanding you can use

Unlock the full lesson and continue studying this element.

  • Full teaching sections: What it is; Key points; Rules and numbers; How it is done
  • Check your understanding with answers you can reveal
  • Common mistakes paired with the FAA facts that correct them
View membership options