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AI.VII.M.K3FAA-S-ACS-25 · Nov 2023Knowledge

Effects of atmospheric conditions, including wind, on approach and landing performance.

ACS element text (the applicant demonstrates understanding of)

Effects of atmospheric conditions, including wind, on approach and landing performance.

Bottom line

Ground topography and large buildings can break up the flow of the wind and create wind gusts that change rapidly in direction and speed.

Key numbers

Key numbers for Effects of atmospheric conditions, including wind, on approach and landing performance.
NumberWhat it means
about 21 percent more landing distance for a ten-knot tailwindTailwind penalty
20 percent more landing distance for a ten percent increase in landing speedSpeed penalty

FAA references

  1. PHAK ch. 11 (p. 11-17) — FAA-H-8083-25C (2023)
  2. PHAK ch. 12 (p. 12-8) — FAA-H-8083-25C (2023)
  3. AFH ch. 12, Operational Procedures (pp. 12-4–12-5) — FAA-H-8083-3C
  4. PHAK ch. 11 (p. 11-16) — FAA-H-8083-25C (2023)
  5. RMH ch. 3 (p. 3-7) — FAA-H-8083-2A
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