Helicopter Systems and Components Quiz
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Questions and Answers

What is the primary function of the flapping hinges?

  • To maintain a constant blade setting angle
  • To facilitate angular oscillations in the plane of rotation
  • To perform flapping motion under the influence of aerodynamic forces (correct)
  • To allow for constant pitch control

    • What kind of motion do the drag hinges allow for the blades?

  • Translational movement along the axis
  • Angular oscillations in the plane of rotation (correct)
  • Flapping motion in response to vertical forces
  • Circular motion around the rotor hub

    • The feathering hinges are specifically designed for which purpose?

  • To facilitate backward movement of the blades
  • To enhance the lift coefficient of the blades
  • To change the blade setting angles effectively (correct)
  • To allow for angular oscillations during flight

    • What type of dampers are used to damp blade angular oscillations about the drag hinges?

    <p>Hydraulic dampers</p> Signup and view all the answers

    Where is the tail rotor primarily mounted on the helicopter?

    <p>On the flange of an intermediate gearbox output shaft on the left side</p> Signup and view all the answers

    Which of the following statements about the feathering hinges is correct?

    <p>They enable the blades to perform feathering adjustments</p> Signup and view all the answers

    What mechanism is used to adjust the main rotor thrust?

    <p>Collective pitch control lever</p> Signup and view all the answers

    Which of the following best describes the action of the drag hinges?

    <p>They allow limited controlled movement in the rotor plane</p> Signup and view all the answers

    What is one purpose of the engine separate throttle control?

    <p>To test each engine without changing the main rotor collective pitch</p> Signup and view all the answers

    What happens to the blades when they are influenced by flapping hinges?

    <p>They perform motions due to variable aerodynamic forces</p> Signup and view all the answers

    What does the CПYY-52 primarily control in the helicopter?

    <p>Tail rotor pitch angle automatically</p> Signup and view all the answers

    Which engines does the pump 463Б feed?

    <p>Both engines and the APU</p> Signup and view all the answers

    On what factors does the CПYY-52 limit the maximum setting angle of the tail rotor blades?

    <p>The ambient temperature and pressure which characterize air density</p> Signup and view all the answers

    How many valves are in the tank crossfeed pipelines of the helicopter?

    <p>2 valves</p> Signup and view all the answers

    What is the function of the flapping hinges of the main rotor hub?

    <p>Allow the blades to perform angular oscillation or flapping motion</p> Signup and view all the answers

    What is the primary function of the helicopter's pneumatic power system?

    <p>To brake the wheels and inflate tires</p> Signup and view all the answers

    Which of the following describes a function of the main rotor collective pitch control?

    <p>To change the main rotor thrust</p> Signup and view all the answers

    What is the acceptable pressure range for compressed air in the helicopter's pneumatic power system?

    <p>(35 to 45) ± 4 kgf/cm2</p> Signup and view all the answers

    How does the separate throttle control assist in flying with one operating engine?

    <p>By selecting a desired mode of operation</p> Signup and view all the answers

    What might be a misconception about the purpose of the flapping hinges in a rotor hub?

    <p>They allow blades to change angles dynamically</p> Signup and view all the answers

    During flight, how is the pneumatic power system replenished?

    <p>From the main gearbox air compressor</p> Signup and view all the answers

    What does the function of air compressor AK-50T1 entail?

    <p>To recharge the pneumatic power system when the helicopter is on the ground</p> Signup and view all the answers

    What is NOT a function of the helicopter pneumatic power system?

    <p>Inflating the main rotor blades</p> Signup and view all the answers

    Which statement regarding the pneumatic power system pressure is false?

    <p>Pressure should be constant above 50 kgf/cm2</p> Signup and view all the answers

    What happens to the velocity of subsonic air as it flows through a convergent nozzle?

    <p>Increases</p> Signup and view all the answers

    What describes a modular constructed gas turbine engine?

    <p>Its major components can be removed and replaced without disturbing the rest of the engine</p> Signup and view all the answers

    Which law is associated with the relationship of kinetic, pressure, and potential energy in fluid flow?

    <p>Bernoulli's theorem</p> Signup and view all the answers

    How can the density of gas be expressed?

    <p>Weight/volume</p> Signup and view all the answers

    What effect does a divergent duct have on subsonic flow?

    <p>Decrease velocity, increase pressure</p> Signup and view all the answers

    What is the primary purpose of a diffuser in a gas turbine engine?

    <p>Increase the static pressure of the air</p> Signup and view all the answers

    Where is gas pressure greatest in a gas turbine engine?

    <p>Compressor outlet</p> Signup and view all the answers

    What is the ultimate limiting factor of turbine engine operation?

    <p>Turbine inlet temperature</p> Signup and view all the answers

    What could cause the engine to shut down for acceleration to limit rpm?

    <p>All of the above</p> Signup and view all the answers

    Why might the OIL PRESS NORMAL indicator fail to activate during engine operation?

    <p>Bulb failure, faulty wiring or oil pressure switch</p> Signup and view all the answers

    What is a potential reason for flickering of the OIL PRESS NORMAL annunciator?

    <p>Foreign particles under oil pump block by-pass valve</p> Signup and view all the answers

    Which instruments are typically included in the engine power monitoring system of the helicopter?

    <p>All of the above</p> Signup and view all the answers

    How many tachometer generators are part of the ИТЭ-2Т tachometer set?

    <p>Two tachometer generators Д-2M</p> Signup and view all the answers

    What components are included in the ИP-117M engine pressure ratio gauge set?

    <p>All are correct</p> Signup and view all the answers

    Which issue could cause high fuel flow at idling?

    <p>Clogging of regulating pump control pressure line fuel filter</p> Signup and view all the answers

    What is a possible consequence of low resistance in the oil pump block by-pass valve spring?

    <p>Inefficient oil circulation leading to potential engine failure</p> Signup and view all the answers

    Study Notes

    Helicopter Systems and Components

    • The pump 463Б supplies fuel to the LH engine, RH engine, and APU (AИ-9B).
    • The tank crossfeed pipelines are equipped with 2 valves.

    Pneumatic Power System

    • Functions include braking the main landing gear wheels and inflating wheel tires from airborne air bottles.
    • Compressed air pressure in the system should be between 35 to 45 ± 4 kgf/cm2.
    • Pneumatic power system is replenished during flight by air compressors mounted on the engines.
    • Air compressor AK-50T1 recharges the pneumatic system both on the ground and in flight.

    Rotor Hinge Functions

    • Flapping hinges facilitate flapping motion due to aerodynamic forces.
    • Drag hinges allow for angular oscillations in the plane of rotation.
    • Feathering hinges enable changes in blade setting angles.
    • Blade hunting oscillations about drag hinges are damped using pneumatic or hydraulic dampers.

    Tail Rotor and Main Rotor Control

    • The tail rotor is mounted on the flange of the intermediate gearbox output shaft, positioned on the left side.
    • Main rotor thrust is adjusted via collective pitch control lever, affecting pitch and engine power.
    • Engine throttles enable testing and controlling thrust for individual engines without altering collective pitch.

    Tail Rotor Control Systems

    • The CПYY-52 automatically manages tail rotor pitch angle based on environmental factors, including air temperature and pressure.

    Aerodynamics and Gas Turbine Engine Principles

    • Subsonic air velocity increases as it passes through a convergent nozzle, while a divergent duct causes a decrease in velocity and increase in pressure.
    • A diffuser's purpose is to boost static pressure of air.
    • Gas pressure peaks at the compressor outlet in turbine engines.
    • The velocity of air is at its maximum at the exhaust nozzle exit.

    Engine Monitoring and Maintenance

    • Engine power monitoring instruments include an electric magnetic drag-type tachometer (ИТЭ-2Т) and an engine pressure ratio gauge (ИP-117).
    • The ИТЭ-2Т tachometer set contains two indicator units and one generator.
    • Flickering of oil pressure normal annunciator may indicate foreign particles under the pump valve or low valve spring resistance.
    • Engine shutdown may occur due to clogged filters, high idling fuel flow, or air in the fuel system.

    General Notes

    • Understanding the operational principles and maintenance requirements is essential for effective helicopter operation and safety.

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    MI Helicopter Airframe & Engine Questions (09.07.2019) PDF

    Description

    Test your knowledge on the various systems and components of helicopters, including fuel supply, pneumatic power systems, rotor hinge functions, and control mechanisms for tail and main rotors. This quiz covers essential principles that underpin helicopter operation and design.

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