AI.X.G.K2FAA-S-ACS-25 · Nov 2023Knowledge

Flight situations where elevator trim stalls could occur.

ACS element text (the applicant demonstrates understanding of)

Flight situations where elevator trim stalls could occur.

Bottom line

At the time a pilot decides to go around, a trim setting for low airspeed is in place, and the sudden addition of power tends to raise the airplane's nose and causes left yaw. Allowing the nose to rise too early on a go-around at low altitude could result in an unrecoverable stall. In a properly trimmed airplane flying with the elevator trailing edge down, turbulence combined with further slowing can make the trim tab ineffective, and the nose may pitch up, possibly resulting in a stall.

Key numbers

Key numbers for Flight situations where elevator trim stalls could occur.
NumberWhat it means
3 flight situations where the critical AOA is most frequently exceeded: low speed, high speed, and turningAOA situations

FAA references

  1. AFH ch. 9 (p. 9-11) — FAA-H-8083-3C
  2. PHAK ch. 6 (p. 6-6) — FAA-H-8083-25C (2023)
  3. PHAK ch. 5 (p. 5-25) — FAA-H-8083-25C (2023)
  4. AIH ch. 9 (p. 9-9) — FAA-H-8083-9B
  5. AFH ch. 17 (pp. 17-12–17-14) — FAA-H-8083-3C
  6. AFH ch. 18 (p. 18-11) — FAA-H-8083-3C
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