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AI.III.C.R1aFAA-S-ACS-25 · Nov 2023Risk management

a. Circumstances that would make diversion prudent

ACS element text (the applicant demonstrates understanding of)

Making the go/no-go and continue/divert decisions, including: a. Circumstances that would make diversion prudent

Bottom line

Areas en route or near airports may be below VFR minimums even when reporting stations are at or near VFR minimums; be especially cautious when the temperature and dewpoint spread is 3 °C or less, because fog may form. Do not continue VFR into IMC; instead, wait it out or turn around if en route weather lowers below your personal limits. Have a contingency plan for alternates if unexpected circumstances arise.

FAA references

  1. AFH ch. 5, Environmental Factors (p. 5-2) — FAA-H-8083-3C
  2. RMH ch. 1 (p. 1-1) — FAA-H-8083-2A
  3. AC 91-92, paras. 7.7, 8.1, 8.2 — AC No: 91-92
  4. AFH ch. 13 (pp. 13-9–13-10) — FAA-H-8083-3C
  5. PHAK ch. 13 (p. 13-11) — FAA-H-8083-25C (2023)
  6. 14 CFR 91.527 (Operating in icing conditions.) — eCFR current as of 2026-03-05
  7. AWH ch. 3 (p. 3-3) — FAA-H-8083-28A
  8. RMH ch. 5 (p. 5-2) — FAA-H-8083-2A
  9. PHAK ch. 2 (p. 2-18) — FAA-H-8083-25C (2023)
  10. AFH ch. 5, Human Factors (p. 5-2) — FAA-H-8083-3C
  11. RMH ch. 5 (p. 5-4) — FAA-H-8083-2A
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