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PA.X.B.K2FAA-S-ACS-6C · Nov 2023Knowledge

VMC (red line), VYSE (blue line), and safe single-engine speed (VSSE).

ACS element text (the applicant demonstrates understanding of)

VMC (red line), VYSE (blue line), and safe single-engine speed (VSSE).

Bottom line

VMC is the calibrated airspeed at which, following the sudden critical loss of thrust, it is possible to maintain control of the airplane. VYSE is the best rate of climb speed with one engine inoperative, marked with a blue radial line on most airspeed indicators. VSSE is the minimum speed to intentionally render the critical engine inoperative.

Key numbers

Key numbers for VMC (red line), VYSE (blue line), and safe single-engine speed (VSSE).
NumberWhat it means
more than 3 knots per degree of bank less than 5 degreesVMC bank effect

FAA references

  1. AFH ch. 13 (pp. 13-1–13-2) — FAA-H-8083-3C
  2. FAA-P-8740-66, Flying Light Twins Safely — FAA-P-8740-66
  3. PHAK ch. 8 (p. 8-10) — FAA-H-8083-25C (2023)
  4. AFH ch. 13 (p. 13-23) — FAA-H-8083-3C
  5. PHAK ch. 9 (p. 9-3) — FAA-H-8083-25C (2023)
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