Planetary Reduction Gear Mechanism
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Questions and Answers

What type of reduction gear is used in this system?

  • Planetary, two stage (correct)
  • Single stage
  • Helical
  • Cylindrical

    • Which material is used for the reduction gear casing?

  • Aluminum (correct)
  • Steel
  • Titanium
  • Plastic

    • What lubrication system is employed for the reduction gear?

  • Oil mist lubrication
  • Grease lubrication
  • Dry lubrication
  • Forced, splash type (correct)

    • How much oil is required for the lubrication of the reduction gear?

    <p>120 cc</p> Signup and view all the answers

    What component is used to bleed compressed air into the atmosphere?

    <p>Bleeder jet</p> Signup and view all the answers

    What happens when the main engine start button is depressed?

    <p>The disc valve moves to the right</p> Signup and view all the answers

    Which part keeps the air valve piston in the closed position?

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

    What ensures a progressive rise of air pressure upstream of the turbine?

    <p>Bleeder jet</p> Signup and view all the answers

    What is the main function of the pneumatic relay in the temperature control system?

    <p>To ensure the heater exhaust pipe is free from carbon deposit.</p> Signup and view all the answers

    Which temperature range is maintained inside the crew cabin and passenger compartment?

    <p>10°C to 30°C</p> Signup and view all the answers

    What components are functioning together with the automatic temperature control unit?

    <p>Two temperature pickups, two sensors, one setter, and two fuel valves.</p> Signup and view all the answers

    Where are the temperature pickups installed in the cargo compartment?

    <p>One at the front near the entrance and one at the rear near the clamshell door.</p> Signup and view all the answers

    What role do the temperature sensors IS-264A-2 play in the heater system?

    <p>They send resistance signals to the temperature control unit.</p> Signup and view all the answers

    What happens if the fan is not turned on in the pneumatic relay system?

    <p>The diaphragm remains unpressed and no electrical supply goes to the fuel valve.</p> Signup and view all the answers

    How do the temperature pickups affect the automatic temperature control circuit?

    <p>They modify the resistance and send temperature signals to the control unit.</p> Signup and view all the answers

    What is the role of the bypass fuel valves 772 in the temperature control system?

    <p>To control the flow rate of fuel through the injector.</p> Signup and view all the answers

    What is the maximum acceptable deviation for maintaining the Ngg takeoff rotational speed?

    <p>±0.15%</p> Signup and view all the answers

    How is the Ngg CP calculated from Ngg takeoff?

    <p>Ngg cp = Ngg takeoff + ΔNgg 0</p> Signup and view all the answers

    When should the EAMU readjust the gas generator RPM and TGT limitation control loops?

    <p>When Ngg - Ngg(next engine) &gt; 7% and Ngg &gt; 80%</p> Signup and view all the answers

    What is the maximum EGT limitation at takeoff and contingency power?

    <p>EGT must be maintained below a certain threshold.</p> Signup and view all the answers

    What altitude must the CP constant value be held to in ISA conditions?

    <p>1500 m</p> Signup and view all the answers

    What triggers the output command for engine shutdown?

    <p>Free turbine reaches the maximum tolerable RPM</p> Signup and view all the answers

    What conditions must be satisfied to hold the TOP constant value to an altitude of 3800 m?

    <p>ISA and ISA + 30ºC conditions must be met.</p> Signup and view all the answers

    What condition leads to the recording of the take-off power?

    <p>Tg (T/O) (max) - Tg (T/O) (actual) ≤ 15ºC</p> Signup and view all the answers

    What function does the BARK-78 perform when engine speed is reduced to 7% below maximum RPM?

    <p>It removes signal from the MKT-163 actuator.</p> Signup and view all the answers

    Which components are part of the SNK-78 system?

    <p>Input/output device, Power independent memory, Indicator</p> Signup and view all the answers

    When does the SNK-78 counter get energized?

    <p>When the helicopter power is turned down.</p> Signup and view all the answers

    What is the purpose of the input/output device within SNK-78?

    <p>To receive and transmit electric signals and data.</p> Signup and view all the answers

    What is the main purpose of the SNK-78 system?

    <p>To register engine operation time and unauthorized turn-offs.</p> Signup and view all the answers

    How does SNK-78 handle input signals to prevent damage?

    <p>By standardizing the signals and protecting from over voltages.</p> Signup and view all the answers

    What occurs when the CP switch is turned ON in relation to the MKT-163 actuator?

    <p>The actuator comes into action under specific conditions.</p> Signup and view all the answers

    Which of the following describes the role of the computing device in SNK-78?

    <p>It receives input from sensors to calculate data.</p> Signup and view all the answers

    What is the maximum air temperature allowed at the heater inlet for starting the heater in recirculation mode?

    <p>+15 °C</p> Signup and view all the answers

    What pressure does the fuel pump raise kerosene to after it has passed the solenoid valve?

    <p>2 + 0.5 Kg/Cm2</p> Signup and view all the answers

    What is the function of the pressure regulator in the fuel flow path?

    <p>To hold fuel pressure constant</p> Signup and view all the answers

    In which direction does the heated air flow after leaving the combustion chamber?

    <p>Through the insulated flues</p> Signup and view all the answers

    What should you do before switching the heater operation rating from automatic to manual?

    <p>Switch off to neutral and cool the heater</p> Signup and view all the answers

    What must be done after an abortive start attempt of the heater?

    <p>Blow off the heater</p> Signup and view all the answers

    Which of the following conditions prohibits starting the heater?

    <p>When the heater inlet temperature exceeds 13 °C</p> Signup and view all the answers

    Which component increases the weight of the kerosene before reaching the injector?

    <p>Fuel pump</p> Signup and view all the answers

    Study Notes

    Reduction Gear System

    • Features a planetary, two-stage reduction gear.
    • Components include:
      • Aluminum reduction gear casing
      • Steel gears for the planetary mechanism
      • Titanium carrier
      • Steel torsion shaft
    • Mounted on ball and roller bearings.
    • Utilizes a centralized, forced splash lubrication system with engine oil.
    • Starter holds 120 cc of oil for lubrication.

    Air Starter Operation

    • Compressed air from the SAFIR engine feeds into the air starter air valve.
    • Two vents bleed compressed air to ensure hot air supply.
    • Air flows through an air filter to the control unit's disc valve.
    • Depressing the engine start button activates the solenoid valve, which controls air passage to the piston.
    • The pneumatic relay diaphragm prevents fuel valve actuation until the fan is activated, maintaining exhaust cleanliness.

    Temperature Regulation

    • Temperature Regulator Control Unit 4087-3C converts resistance from temperature pickups and sensors into electrical signals.
    • Maintains helicopter cabin air temperature between 10°C and 30°C, based on pre-set values.
    • Automatic temperature control facilitated by:
      • Two temperature pickups
      • Two temperature sensors
      • Temperature setter
      • Bypass fuel valves

    Temperature Pickups and Sensors

    • Two pickups located in the cargo compartment to sense temperature for automatic control.
    • Temperature sensors installed at the kerosene combustion heater's inlet and outlet.
    • Heater cannot operate in re-circulation mode if cabin temperature exceeds 15°C.

    Fuel and Air Flow Path

    • Kerosene supplied from the service tank at a pressure of 0 to 0.3 Kg/cm² to the fuel pump, raising pressure to 2±0.5 Kg/cm².
    • Fuel filter and pressure regulator maintain output pressure at 1.6±0.1 Kg/cm².
    • Air from a running blower mixes with kerosene in the combustion chamber for ignition.
    • Heated gases flow through insulated flues to heat ambient air for the cabin and passenger compartments.

    Operating Cautions for Heater Control

    • Switch between automatic and manual control must occur only after a cooling period of 10-15 minutes.
    • Heating operation prohibited if heater inlet temperature exceeds 13°C.
    • Heater should not start if there are fuel or oil leaks.
    • After a failed start, heater must be blown off before retrying.

    Monitoring and Adjustment

    • Precision maintained on gas generator rotor speed with a tolerance of ±0.15%, influenced by outside air temperature and pressure.
    • Operations include:
      • Maximum EGT limitation during takeoff.
      • Commands for engine shutdown based on RPM thresholds.
      • Re-adjustment of RPM and gas temperature for continuous power ratings.

    SNK-78 Monitoring Counter

    • Designed for objective tracking of engine operating time across modes and unauthorized shut-offs.
    • Comprises:
      • Power source converting airborne mains voltage
      • Input/output device for signal processing
      • Computing device for calculations
      • Power-independent memory for data storage
      • Indicator for display
      • Read button for data access
      • Connection capability for test equipment.

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    Description

    Explore the intricacies of a two-stage planetary reduction gear system. This quiz covers key elements such as materials used for the casing, gears, and shafts, as well as the lubrication methods. Ideal for those studying mechanical engineering and gear design.

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