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CA.IV.F.K2FAA-S-ACS-7B · 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
35 mphWinds aloft
1 to 5 knotsCrosswind vortex
2 or 3 knotsVortex drift
1,500 to 2,000 fpmMountain downdrafts

FAA references

  1. PHAK ch. 11 (p. 11-16) — FAA-H-8083-25C (2023)
  2. RMH ch. 3 (p. 3-7) — FAA-H-8083-2A
  3. PHAK ch. 12 (p. 12-8) — FAA-H-8083-25C (2023)
  4. AIM 7-6-7 (Mountain Flying) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  5. AIM 7-4-4 (Vortex Behavior) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  6. AFH ch. 12, Operational Procedures (p. 12-4) — FAA-H-8083-3C
  7. AFH ch. 13 (p. 13-21) — FAA-H-8083-3C
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