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CA.I.G.K1jFAA-S-ACS-7B · Nov 2023Knowledge

j. Deicing and anti-icing

ACS element text (the applicant demonstrates understanding of)

Airplane systems, including: j. Deicing and anti-icing

Bottom line

Anti-icing equipment prevents ice from forming, while deicing equipment removes ice that has already formed. Having anti-icing and deicing equipment installed does not necessarily mean the airplane is approved for flight in icing conditions. Most light aircraft have only a heated pitot tube and are not certified for flight in icing.

Key numbers

Key numbers for j. Deicing and anti-icing
NumberWhat it means
up to 40 degrees of compass deviation from windscreen anti-ice electrical currentCompass error

FAA references

  1. PHAK ch. 7 (pp. 7-40–7-41) — FAA-H-8083-25C (2023)
  2. AFH ch. 13 (pp. 13-9–13-10) — FAA-H-8083-3C
  3. PHAK ch. 7 (p. 7-41) — FAA-H-8083-25C (2023)
  4. SEA ch. 7 (p. 7-4) — FAA-H-8083-23
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