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AI.II.D.K6FAA-S-ACS-25 · Nov 2023Knowledge

Wingtip vortices and appropriate precautions.

ACS element text (the applicant demonstrates understanding of)

Wingtip vortices and appropriate precautions.

Bottom line

Wake turbulence is wingtip vortices created when an airplane generates lift. Vortices are generated from the moment an aircraft leaves the ground until it touches down.

Key numbers

Key numbers for Wingtip vortices and appropriate precautions.
NumberWhat it means
2–3 knots over the ground when vortices of larger aircraft sink close to the groundLateral drift
Avoid following another aircraft on a similar flight path within 1,000 feetAvoidance altitude

FAA references

  1. AFH Glossary (p. G-18) — FAA-H-8083-3C
  2. PHAK ch. 14 (pp. 14-27–14-28) — FAA-H-8083-25C (2023)
  3. PHAK ch. 5 (p. 5-9) — FAA-H-8083-25C (2023)
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