AA.VII.D.K1FAA-S-ACS-11A · Nov 2023Knowledge

Flight characteristics and controllability associated with maneuvering the airplane wit...

ACS element text (the applicant demonstrates understanding of)

Flight characteristics and controllability associated with maneuvering the airplane with powerplant(s) inoperative, including the importance of drag reduction.

Bottom line

Controllability is the capability of an aircraft to respond to the pilot's control, especially with regard to flight path and attitude. A windmilling propeller has, in many cases, given the improperly trained multiengine pilot the mistaken perception that the engine is still developing useful thrust. The aircraft drag defines the thrust required to maintain steady, level flight.

Key numbers

Key numbers for Flight characteristics and controllability associated with maneuvering the airplane wit...
NumberWhat it means
no lower than 3,000 feet AGLRestart floor
minimum of 400 feet AGLLow-alt minimum

FAA references

  1. PHAK ch. 5 (p. 5-15) — FAA-H-8083-25C (2023)
  2. AFH ch. 13 (pp. 13-35–13-36) — FAA-H-8083-3C
  3. PHAK ch. 11 (p. 11-5) — FAA-H-8083-25C (2023)
  4. AFH ch. 17 (p. 17-15) — FAA-H-8083-3C
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