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CA.I.C.K3cFAA-S-ACS-7B · Nov 2023Knowledge

c. Temperature and heat exchange

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: c. Temperature and heat exchange

Bottom line

Be especially cautious when the temperature and dewpoint spread is 3 °C or less, because fog may form. Temperature information from the winds aloft forecast is useful to help determine icing levels.

Key numbers

Key numbers for c. Temperature and heat exchange
NumberWhat it means
3 °C or less temperature/dewpoint spreadFog risk

FAA references

  1. AC 91-92, para. 8.2 — AC No: 91-92
  2. AC 91-92 Appendix A — AC No: 91-92
  3. AFH ch. 11 (p. 11-7) — FAA-H-8083-3C
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