FH.XI.K.K1a

From the FAA library

• Helicopter Flying Handbookp. 11-16
  Chapter 11: Helicopter Emergencies and Hazards › System Malfunctions › Antitorque System Failure

  System Malfunctions By following the manufacturer’s recommendations regarding operating limits and procedures and periodic maintenance and inspections, many system and equipment failures can be eliminated. Certain malfunctions or failures can be traced to some error on the part ... pilot; therefore, appropriate flying techniques and use of threat and error management may help to prevent an emergency Antitorque System Failure Antitorque failure usually falls into one of two categories. One is failure of the power drive portion…

• Helicopter Flying Handbookp. 4-8
  Chapter 4: Helicopter Components, Sections, and Systems › Antitorque System › NOTAR®

  Fenestron Another form of antitorque system is the Fenestron or “fanin-tail” design. This system uses a series of rotating blades shrouded within a vertical tail. Because the blades are located within a circular duct, they are less likely ... into contact with people or objects. [Figure 4-14] NOTAR® Using the natural characteristics of helicopter aerodynamics, the NOTAR® antitorque system provides safe, quiet, responsive, foreign object damage (FOD) resistant directional control. The enclosed variable-pitch composite blade fan produces…

• Helicopter Flying Handbookp. 4-4
  Chapter 4: Helicopter Components, Sections, and Systems › Main Rotor System › Rigid Rotor System

  comprised of glass fiber reinforced material. The hub is a single piece of forged rigid titanium. The rigid rotor system is very responsive and is usually not susceptible to mast bumping like the semirigid systems because the rotor hubs ... fuselage to move together as one entity and eliminates much of the oscillation usually present in the other rotor systems. Other advantages of the rigid rotor include a reduction in the weight and drag of the rotor…

• Helicopter Flying Handbookp. 4-7
  Chapter 4: Helicopter Components, Sections, and Systems › Antitorque System

  Antitorque System Helicopters with a single, main rotor system require a separate antitorque system. This is most often accomplished through a variable pitch, antitorque rotor or tail rotor. [Figure 4-13] Pilots vary the thrust of the antitorque system ... transmission to ensure tail rotor rotation (and hence control) in the event that the engine quits. Usually, negative antitorque thrust is needed in autorotations to overcome transmission friction. Figure 4-12. Freewheeling unit in normal drive position and freewheeling position…

• Helicopter Flying Handbookp. 4-16
  Chapter 4: Helicopter Components, Sections, and Systems › Hydraulics

  powered helicopters, incorporate the use of hydraulic actuators to overcome high control forces. [Figure 4-25] A typical hydraulic system consists of actuators, also called servos, on each flight control, a pump which is usually driven by the main rotor ... reservoir to store the hydraulic fluid. Some helicopters have accumulators located on the pressure side of the hydraulic system. This allows for a continuous fluid pressure into the system. A switch in the cockpit can turn the system off, although…

• Aviation Maintenance Technician Handbook - Powerplantp. 3-22
  Chapter 3: Induction & Exhaust Systems › Reciprocating Engine Exhaust Systems › Reciprocating Engine Exhaust System Maintenance Practices

  Reciprocating Engine Exhaust System Maintenance Practices Any exhaust system failure should be regarded as a severe hazard. Depending on the location and type of failure, an exhaust system failure can result in carbon monoxide poisoning of crew and passengers, partial ... complete loss of engine power, or an aircraft fire. Cracks in components, leaking gaskets, or complete failure can cause serious problems in flight. Often, these failures can be detected before complete failure. Black soot around an exhaust gasket shows…