Flight Instructor for Airplane Category › XIII. Multiengine Operations › Task C. Demonstration of Effects of Various Airspeeds and Configurations during Engine Inoperative Performance (AMEL and AMES)

AI.XIII.C.K5d

Knowledge

Effects on performance of various configurations including:

Windmilling propeller on the inoperative engine

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Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Airplane Flying Handbook p. 13-35
Chapter 13: Transition to Multiengine Airplanes › Engine Inoperative Approach and Landing
With drag from only one windmilling propeller, the airplane tends to float…
Airplane Flying Handbook p. 13-24
Chapter 13: Transition to Multiengine Airplanes › Engine Inoperative Flight Principles › Derivation of VMC
determination (section 23.149(b)(5)). VMC increases with increased drag on the inoperative engine. VMC is highest, therefore, when the critical engine propeller is windmilling at the low pitch, high rpm blade angle. VMC is normally determined with the critical…
Airplane Flying Handbook p. 13-24
Chapter 13: Transition to Multiengine Airplanes › Engine Inoperative Flight Principles › ⦁ All propeller controls in the recommended takeoff position throughout VMC determination
VMC is highest, therefore, when the critical engine propeller is windmilling at…
Airplane Flying Handbook p. 13-3
Chapter 13: Transition to Multiengine Airplanes › Operation of Systems › Feathering Propellers
inoperative engine minimizes propeller drag. [Figure 13-2] Depending upon single-engine performance, this feature often permits continued flight to a suitable airport following an engine failure. Feathering is important because of the change in parasite drag with propeller blade ... smaller blade angles near the flat pitch position, the drag added by the propeller is large. At these small blade angles, the propeller windmilling at high revolutions per minute (rpm) can create enough drag to make the airplane difficult…
14 CFR Part 135 — Operating Requirements: Commuter and on Demand Operations and Rules Governing Persons on Board Such Aircraft Open
14 CFR Part 135, Appendix A to Part 135—Additional Airworthiness Standards for 10 or More Passenger Airplanes
gravity, the critical engine inoperative, the remaining engines at the maximum takeoff power or thrust, and the propeller of the inoperative engine windmilling with the propeller controls in the normal position except that, if an approved automatic feathering system…