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IR.II.A.R1FAA-S-ACS-8C · Nov 2023Risk management

Operations in icing conditions.

ACS element text (the applicant demonstrates understanding of)

Operations in icing conditions.

Bottom line

Icing–Icing conditions constitute a hazard, and in-flight ice accretion has resulted in numerous loss of control accidents. The pilot of an aircraft, which is not certificated or equipped for flight in icing conditions, should avoid all icing conditions.

FAA references

  1. RMH ch. 3 (p. 3-7) — FAA-H-8083-2A
  2. AFH ch. 5, Environmental Factors (p. 5-2) — FAA-H-8083-3C
  3. IFH ch. 4 (pp. 4-16–4-17) — FAA-H-8083-15B
  4. AFH ch. 13 (pp. 13-9–13-10) — FAA-H-8083-3C
  5. PHAK ch. 7 (p. 7-40) — FAA-H-8083-25C (2023)
  6. AC 91-74, para. 1-5 — AC No: 91-74A
  7. RMH ch. 5 (p. 5-2) — FAA-H-8083-2A
  8. PHAK ch. 7 (p. 7-41) — FAA-H-8083-25C (2023)
  9. AC 91-74 Appendix 3 — AC No: 91-74A
  10. 14 CFR 91.527 (Operating in icing conditions.) — eCFR current as of 2026-03-05
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