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CA.VII.A.R4FAA-S-ACS-7B · Nov 2023Risk management

Effect of environmental elements on airplane performance (e.g., turbulence, microbursts...

ACS element text (the applicant demonstrates understanding of)

Effect of environmental elements on airplane performance (e.g., turbulence, microbursts, and highdensity altitude).

Bottom line

Microburst activity may be indicated by an intense rain shaft at the surface but virga at cloud base and a ring of blowing dust is often the only visible clue. Maintain awareness of conditions that can lead to various types of turbulence, such as clear air turbulence, mountain waves, wind shear, and thunderstorms or microbursts.

FAA references

  1. AFH ch. 5, Environmental Factors (p. 5-2) — FAA-H-8083-3C
  2. RMH ch. 3 (p. 3-7) — FAA-H-8083-2A
  3. PHAK ch. 12 (pp. 12-10–12-11) — FAA-H-8083-25C (2023)
  4. AFH ch. 5, Slow Flight (p. 5-9) — FAA-H-8083-3C
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