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AA.V.A.K4FAA-S-ACS-11A · Nov 2023Knowledge

Effects of autoflight, flight envelope protection in normal and degraded modes, and une...

ACS element text (the applicant demonstrates understanding of)

Effects of autoflight, flight envelope protection in normal and degraded modes, and unexpected disconnects of the autopilot or autothrottle/autothrust, if applicable to the aircraft used for the evaluation.

Bottom line

Envelope-protected airplanes have, in general, demonstrated a lower rate of stall accidents and incidents; however, the rate is not zero. Stall accidents and incidents in envelope-protected airplanes typically occur when the protections have failed, requiring the pilot to return the aircraft to safe flight using a degraded flight control mode.

FAA references

  1. AC 120-109, para. 2-1, 2-2 — AC No: 120-109A
  2. RMH ch. 7 (p. 7-2) — FAA-H-8083-2A
  3. RMH Glossary — FAA-H-8083-2A
  4. AFH ch. 5, Mechanical Factors (p. 5-2) — FAA-H-8083-3C
  5. PHAK ch. 6 (p. 6-12) — FAA-H-8083-25C (2023)
  6. AC 120-109, para. 3-2 — AC No: 120-109A
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