Flight Instructor for Rotorcraft Category Helicopter Rating › XI. Emergency Operations › Task A. Powerplant Failure in a Hover in a Single-Engine Helicopter

HI.XI.A.K3

Knowledge

High and low inertia of rotor systems.

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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. 11-14
Chapter 11: Helicopter Emergencies and Hazards › Low-G Conditions and Mast Bumping
rotor disk angle to the left becomes quite large and may exceed the clearances built into the rotor hub. This results in the hub contacting the rotor mast, which is known as mast bumping. [Figure 11-8] Low-G mast ... very low-altitude tactical flight technique used by the military where the aircraft flies following the contours of the geographical terrain. The accident sequence may be extremely rapid, and the energy and inertia in the rotor system can sever…
Helicopter Flying Handbook p. 11-21
Chapter 11: Helicopter Emergencies and Hazards › System Malfunctions › Reducing the Onset of LTE
Reducing the Onset of LTE To help reduce the onset of LTE…
Seaplane, Skiplane, and Float/Ski Equipped Helicopter Operations Handbook p. 9-2
OPERATIONAL CONSIDERATIONS
Perform approaches, in which hover power may not be available, by flaring through hovering altitude in a slightly nose-high attitude to reduce forward motion. Just prior to the aft portion of the floats touching down, add sufficient collective pitch ... helicopter to settle to the ground, then reduce collective pitch to the full down position. In helicopters with low inertia rotor systems, an autorotation to a hard surface requires a more aggressive flare to a near-zero groundspeed to ensure…