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PA.IV.M.R9FAA-S-ACS-6C · Nov 2023Risk management

Unstable approach.

ACS element text (the applicant demonstrates understanding of)

Unstable approach.

Bottom line

Because of the location of the pitot tube and static vents, airspeed indicators in some airplanes may have considerable error when the airplane is in a slip.

FAA references

  1. AFH ch. 9 (pp. 9-13–9-15) — FAA-H-8083-3C
  2. AIM 10-1-2 (Helicopter Instrument Approaches) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
  3. AIM 5-4-7 (Instrument Approach Procedures) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
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