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AI.XIII.A.R1FAA-S-ACS-25 · Nov 2023Risk management

Potential engine failure during flight.

ACS element text (the applicant demonstrates understanding of)

Potential engine failure during flight.

Bottom line

A windmilling propeller, in many cases, has given the improperly trained multiengine pilot the mistaken perception that the engine is still developing useful thrust, resulting in a psychological reluctance to feather, as feathering results in cessation of propeller rotation. Identification should be primarily through the control inputs required to maintain straight flight, not the engine gauges. A logical and orderly check of gauges, switches, and systems may rectify the problem without resorting to engine feathering.

FAA references

  1. AFH ch. 13 (p. 13-30) — FAA-H-8083-3C
  2. AFH ch. 13 (p. 13-36) — FAA-H-8083-3C
  3. AFH ch. 13 (pp. 13-31–13-32) — FAA-H-8083-3C
  4. AFH ch. 13 (pp. 13-5–13-6) — FAA-H-8083-3C
  5. FAAP874066 Landing Gear Selected Up, OEI Climb Performance Adequate — FAA-P-8740-66
  6. FAA-P-8740-66, Flying Light Twins Safely — FAA-P-8740-66
  7. RMH ch. 3 (p. 3-4) — FAA-H-8083-2A
  8. RMH ch. 3 (p. 3-1) — FAA-H-8083-2A
  9. AFH ch. 9 (p. 9-29) — FAA-H-8083-3C
  10. PHAK ch. 9 (p. 9-4) — FAA-H-8083-25C (2023)
  11. AFH ch. 9 (p. 9-28) — FAA-H-8083-3C
  12. AFH ch. 9 (p. 9-14) — FAA-H-8083-3C
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