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CA.IX.E.K1FAA-S-ACS-7B · Nov 2023Knowledge

Factors affecting minimum controllable speed (VMC).

ACS element text (the applicant demonstrates understanding of)

Factors affecting minimum controllable speed (VMC).

Bottom line

The Vmc noted in practice or demonstration, or in actual OEI operation, could be less or even greater than the published value.

Key numbers

Key numbers for Factors affecting minimum controllable speed (VMC).
NumberWhat it means
more than 3 knots per degree of bank less than 5 degreesBank effect
almost 20 knots above published VMCLevel wings
within 20 degrees of original headingHeading change
no more than 5 degrees of bankCert bank
VMC plus 5 knotsNo-published Vr

FAA references

  1. PHAK Glossary (p. G-33) — FAA-H-8083-25C (2023)
  2. FAA-P-8740-66, Flying Light Twins Safely — FAA-P-8740-66
  3. PHAK ch. 9 (p. 9-3) — FAA-H-8083-25C (2023)
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