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AA.I.A.K15FAA-S-ACS-11A · Nov 2023Knowledge

Envelope protection–angle of attack warning and protection, and speed protection.

ACS element text (the applicant demonstrates understanding of)

Envelope protection–angle of attack warning and protection, and speed protection.

Bottom line

In response to a stall warning, the proper action is for the pilot to apply a nose-down input until the stall warning stops (pitch trim may be necessary).

Key numbers

Key numbers for Envelope protection–angle of attack warning and protection, and speed protection.
NumberWhat it means
16°–20° depending on the airplane designCritical AOA
activates around 107 percent of the actual stall speedStick shaker

FAA references

  1. AFH ch. 5, Angle of Attack (p. 5-9) — FAA-H-8083-3C
  2. PHAK ch. 8 (p. 8-22) — FAA-H-8083-25C (2023)
  3. AFH ch. 16 (p. 16-8) — FAA-H-8083-3C
  4. AFH ch. 1 (p. 1-13) — FAA-H-8083-3C
  5. PHAK ch. 5 (p. 5-38) — FAA-H-8083-25C (2023)
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