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PA.X.B.K3FAA-S-ACS-6C · Nov 2023Knowledge

Cause of loss of directional control at airspeeds below VMC.

ACS element text (the applicant demonstrates understanding of)

Cause of loss of directional control at airspeeds below VMC.

Bottom line

Where Vs is encountered at or before Vmc, the departure from controlled flight may be quite sudden, with strong yawing and rolling (spinning) tendencies toward the idle engine.

Key numbers

Key numbers for Cause of loss of directional control at airspeeds below VMC.
NumberWhat it means
Published VMC almost always higher than Vs, except for a few modelsVMC vs Vs

FAA references

  1. FAA-P-8740-66, Flying Light Twins Safely — FAA-P-8740-66
  2. AFH ch. 13 (pp. 13-23–13-24) — FAA-H-8083-3C
  3. AFH ch. 13 (p. 13-17) — FAA-H-8083-3C
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