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AI.II.E.K1jFAA-S-ACS-25 · 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

The presence of anti-icing and deicing equipment, even though it may appear elaborate and complete, does not necessarily mean that the airplane is approved for flight in icing conditions. Anti-icing and deicing equipment are not intended to sustain long-term flight in icing conditions.

Key numbers

Key numbers for j. Deicing and anti-icing
NumberWhat it means
up to 40° deviation from heated windscreen currentCompass error
typically two zones of heat applicationThermaWing zones

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)
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