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CA.IX.G.R3FAA-S-ACS-7B · Nov 2023Risk management

Configuring the airplane.

ACS element text (the applicant demonstrates understanding of)

Configuring the airplane.

Bottom line

Drag from a windmilling propeller, extended landing gear, flaps extended beyond optimum, or any sideslip will reduce or even eliminate any modest single-engine performance that may exist. With an engine set to zero thrust (or feathered) and the airplane slowed to VYSE, a climb with maximum power on the remaining engine reveals the precise bank angle and ball deflection required for zero sideslip and best climb performance. OEI flight with the ball centered and the remaining engine providing any appreciable power is never correct due to the sideslip generated.

FAA references

  1. FAA-P-8740-66, Flying Light Twins Safely — FAA-P-8740-66
  2. PHAK ch. 2 (p. 2-19) — FAA-H-8083-25C (2023)
  3. PHAK ch. 2 (p. 2-20) — FAA-H-8083-25C (2023)
  4. AFH ch. 13 (p. 13-29) — FAA-H-8083-3C
  5. AFH ch. 13 (p. 13-36) — FAA-H-8083-3C
  6. AFH ch. 9 (p. 9-29) — FAA-H-8083-3C
  7. AFH ch. 13 (p. 13-19) — FAA-H-8083-3C
  8. AIH ch. 1 (p. 1-25) — FAA-H-8083-9B
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