Private Pilot for Rotorcraft Category Helicopter Rating › VIII. Emergency Operations › Task B. Powerplant Failure at Altitude in a Single-Engine Helicopter

PH.VIII.B.S3

Skill

Maintain main rotor (Nr) within normal limits.

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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.

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Helicopter Flying Handbook p. 4-11
Chapter 4: Helicopter Components, Sections, and Systems › Transmission System › Dual Tachometers
NR) on the left and engine rpm (NP) on the right side of the vertical scale. Corresponding color limits are present for each component parameter. Structural Design In helicopters with horizontally mounted engines, another purpose of the main rotor transmission ... divided needle condition is a result of a sudden loss of engine power. Maintaining main rotor rpm is essential for adequate lift. RPM within normal limits produces adequate lift for normal maneuvering. Therefore, it is imperative not only to know…
Helicopter Flying Handbook p. 11-21
Chapter 11: Helicopter Emergencies and Hazards › Recovery Technique (Uncontrolled Right Yaw) › Main Drive Shaft or Clutch Failure
Main Drive Shaft or Clutch Failure The main drive shaft, located between the engine and the main rotor transmission, provides engine power to the main rotor transmission. In some helicopters, particularly those with piston engines, a drive belt is used ... clutch or belt has the same effect as an engine failure because power is no longer provided to the main rotor and an autorotation must be initiated. There are a few differences, however, that need to be taken into consideration…
Helicopter Flying Handbook p. 1-4
Chapter 1: Introduction to the Helicopter › Rotor System › Tandem Rotor
Tandem Rotor Tandem rotor (sometimes referred to as dual rotor) helicopters have two large horizontal rotor assemblies, instead of one main assembly and a smaller tail rotor. [Figure 1-6] Single rotor helicopters need a tail rotor to neutralize ... twisting momentum produced by the single large rotor. Tandem rotor helicopters, however, use counter-rotating rotors, each canceling out the other’s torque. Counter-rotating rotor blades will not collide with and destroy each other if they flex into…
Helicopter Flying Handbook p. 2-25
Chapter 2: Aerodynamics of Flight › Turning Flight
Figure 2-45. Forces acting on the helicopter during turning flight. Autorotation is the state of flight where the main rotor disk of a helicopter is being turned by the action of air moving up through the rotor rather than ... engine power driving the rotor. In normal, powered flight, air is drawn into the main rotor disk from above and exhausted downward, but during autorotation, air moves up into the rotor disk from below as the helicopter descends. Autorotation…
Helicopter Flying Handbook p. 4-6
Chapter 4: Helicopter Components, Sections, and Systems › Main Rotor System › Tandem Rotor
metal-to-metal contact of older bearings and the need for lubrication is eliminated in this design. Tandem Rotor Tandem rotor (sometimes referred to as dual rotor) helicopters have two large horizontal rotor assemblies; a twin rotor system, instead ... main assembly, and a smaller tail rotor. [Figure 4-10] Single rotor helicopters need an anti-torque system to neutralize the twisting momentum produced by the single large rotor. Tandem rotor helicopters, however, use counter-rotating rotors, with each canceling…