Podcast
Questions and Answers
What is the primary function of the flapping hinges?
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?
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?
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?
What type of dampers are used to damp blade angular oscillations about the drag hinges?
Where is the tail rotor primarily mounted on the helicopter?
Where is the tail rotor primarily mounted on the helicopter?
Which of the following statements about the feathering hinges is correct?
Which of the following statements about the feathering hinges is correct?
What mechanism is used to adjust the main rotor thrust?
What mechanism is used to adjust the main rotor thrust?
Which of the following best describes the action of the drag hinges?
Which of the following best describes the action of the drag hinges?
What is one purpose of the engine separate throttle control?
What is one purpose of the engine separate throttle control?
What happens to the blades when they are influenced by flapping hinges?
What happens to the blades when they are influenced by flapping hinges?
What does the CПYY-52 primarily control in the helicopter?
What does the CПYY-52 primarily control in the helicopter?
Which engines does the pump 463Б feed?
Which engines does the pump 463Б feed?
On what factors does the CПYY-52 limit the maximum setting angle of the tail rotor blades?
On what factors does the CПYY-52 limit the maximum setting angle of the tail rotor blades?
How many valves are in the tank crossfeed pipelines of the helicopter?
How many valves are in the tank crossfeed pipelines of the helicopter?
What is the function of the flapping hinges of the main rotor hub?
What is the function of the flapping hinges of the main rotor hub?
What is the primary function of the helicopter's pneumatic power system?
What is the primary function of the helicopter's pneumatic power system?
Which of the following describes a function of the main rotor collective pitch control?
Which of the following describes a function of the main rotor collective pitch control?
What is the acceptable pressure range for compressed air in the helicopter's pneumatic power system?
What is the acceptable pressure range for compressed air in the helicopter's pneumatic power system?
How does the separate throttle control assist in flying with one operating engine?
How does the separate throttle control assist in flying with one operating engine?
What might be a misconception about the purpose of the flapping hinges in a rotor hub?
What might be a misconception about the purpose of the flapping hinges in a rotor hub?
During flight, how is the pneumatic power system replenished?
During flight, how is the pneumatic power system replenished?
What does the function of air compressor AK-50T1 entail?
What does the function of air compressor AK-50T1 entail?
What is NOT a function of the helicopter pneumatic power system?
What is NOT a function of the helicopter pneumatic power system?
Which statement regarding the pneumatic power system pressure is false?
Which statement regarding the pneumatic power system pressure is false?
What happens to the velocity of subsonic air as it flows through a convergent nozzle?
What happens to the velocity of subsonic air as it flows through a convergent nozzle?
What describes a modular constructed gas turbine engine?
What describes a modular constructed gas turbine engine?
Which law is associated with the relationship of kinetic, pressure, and potential energy in fluid flow?
Which law is associated with the relationship of kinetic, pressure, and potential energy in fluid flow?
How can the density of gas be expressed?
How can the density of gas be expressed?
What effect does a divergent duct have on subsonic flow?
What effect does a divergent duct have on subsonic flow?
What is the primary purpose of a diffuser in a gas turbine engine?
What is the primary purpose of a diffuser in a gas turbine engine?
Where is gas pressure greatest in a gas turbine engine?
Where is gas pressure greatest in a gas turbine engine?
What is the ultimate limiting factor of turbine engine operation?
What is the ultimate limiting factor of turbine engine operation?
What could cause the engine to shut down for acceleration to limit rpm?
What could cause the engine to shut down for acceleration to limit rpm?
Why might the OIL PRESS NORMAL indicator fail to activate during engine operation?
Why might the OIL PRESS NORMAL indicator fail to activate during engine operation?
What is a potential reason for flickering of the OIL PRESS NORMAL annunciator?
What is a potential reason for flickering of the OIL PRESS NORMAL annunciator?
Which instruments are typically included in the engine power monitoring system of the helicopter?
Which instruments are typically included in the engine power monitoring system of the helicopter?
How many tachometer generators are part of the ИТЭ-2Т tachometer set?
How many tachometer generators are part of the ИТЭ-2Т tachometer set?
What components are included in the ИP-117M engine pressure ratio gauge set?
What components are included in the ИP-117M engine pressure ratio gauge set?
Which issue could cause high fuel flow at idling?
Which issue could cause high fuel flow at idling?
What is a possible consequence of low resistance in the oil pump block by-pass valve spring?
What is a possible consequence of low resistance in the oil pump block by-pass valve spring?
Flashcards
Helicopter Fuel Pump
Helicopter Fuel Pump
The 463Б pump supplies fuel to the left, right engines, and auxiliary power unit (APU).
Crossfeed Pipelines
Crossfeed Pipelines
Pipelines connecting fuel tanks, controlled by 2 valves.
Pneumatic Power System
Pneumatic Power System
System for braking and tire inflation using compressed air.
Compressed Air Pressure
Compressed Air Pressure
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Pneumatic System Recharge
Pneumatic System Recharge
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Air Compressor AK-50T1
Air Compressor AK-50T1
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Flapping Hinges
Flapping Hinges
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Drag Hinges
Drag Hinges
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Feathering Hinges
Feathering Hinges
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Tail Rotor Mounting
Tail Rotor Mounting
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Collective Pitch Control
Collective Pitch Control
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Engine Throttles
Engine Throttles
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Automatic Tail Rotor Control
Automatic Tail Rotor Control
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Convergent Nozzle
Convergent Nozzle
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Divergent Duct
Divergent Duct
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Diffuser Function
Diffuser Function
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Gas Pressure Peak
Gas Pressure Peak
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Exhaust Nozzle Velocity
Exhaust Nozzle Velocity
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Engine Power Monitoring
Engine Power Monitoring
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Oil Pressure Annunciator Flickering
Oil Pressure Annunciator Flickering
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Engine Shutdown Causes
Engine Shutdown Causes
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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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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.
