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PA.IX.G.K3FAA-S-ACS-6C · Nov 2023Knowledge

How to identify, verify, feather, and secure an inoperative engine.

ACS element text (the applicant demonstrates understanding of)

How to identify, verify, feather, and secure an inoperative engine.

Bottom line

Identifying the failed engine is a two-step process. First, adjust the power to the maximum controllable level on both engines. The failed engine is the side that requires no rudder pressure. After identifying the failed engine, feather that engine and adjust power to maintain descent angle to a landing.

Key numbers

Key numbers for How to identify, verify, feather, and secure an inoperative engine.
NumberWhat it means
400 feet AGLChecklist
2 to 3 degreesOEI bank
one-half ball diameterBall

FAA references

  1. PHAK ch. 2 (p. 2-19) — FAA-H-8083-25C (2023)
  2. PHAK ch. 2 (p. 2-20) — FAA-H-8083-25C (2023)
  3. FAAP874066 Landing Gear Selected Up, OEI Climb Performance Adequate — FAA-P-8740-66
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