Private Pilot for Rotorcraft Category Helicopter Rating › VI. Performance Maneuvers › Task B. Straight-In Autorotation in a Single-Engine Helicopter

PH.VI.B.R7

Risk management

Low rotor rpm or rotor stall.

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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

Helicopter Flying Handbook p. 11-16
Chapter 11: Helicopter Emergencies and Hazards › Low Rotor RPM and Rotor Stall
Other causes of a power-on low rotor rpm condition include the pilot rolling the throttle the wrong way in helicopters not equipped with a governor or a governor failure in helicopters so equipped. As the rpm decreases ... itself rapidly leading to rotor stall. There are a number of ways the pilot can recognize the low rotor rpm situation. Visually, the pilot can not only see the rotor rpm indicator decrease but also the change…
Helicopter Flying Handbook p. 11-15
Chapter 11: Helicopter Emergencies and Hazards › Low-G Conditions and Mast Bumping
because they retain some control authority at low G, occurrences are less common than for teetering rotors. Low Rotor RPM and Rotor Stall Rotor rpm is a critically important parameter for all helicopter operations. Just ... rotor rpm to fall below the safe operating range, the helicopter is in a low rpm situation. If the rotor rpm continues to fall, the rotor will eventually stall…
Helicopter Flying Handbook p. 11-7
Chapter 11: Helicopter Emergencies and Hazards › Common Errors › Autorotation with Turns
when recovering from an aborted autorotation. Some effects to consider are: • Higher rate of descent. • Reduced rotor rpm builds in autorotation. • Low initial rotor rpm response in autorotation. • The requirement for a higher flare height. • Reduced engine power…