Questions and Answers
What type of reduction gear is used in this system?
Which material is used for the reduction gear casing?
What lubrication system is employed for the reduction gear?
How much oil is required for the lubrication of the reduction gear?
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What component is used to bleed compressed air into the atmosphere?
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What happens when the main engine start button is depressed?
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Which part keeps the air valve piston in the closed position?
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What ensures a progressive rise of air pressure upstream of the turbine?
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What is the main function of the pneumatic relay in the temperature control system?
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Which temperature range is maintained inside the crew cabin and passenger compartment?
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What components are functioning together with the automatic temperature control unit?
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Where are the temperature pickups installed in the cargo compartment?
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What role do the temperature sensors IS-264A-2 play in the heater system?
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What happens if the fan is not turned on in the pneumatic relay system?
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How do the temperature pickups affect the automatic temperature control circuit?
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What is the role of the bypass fuel valves 772 in the temperature control system?
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What is the maximum acceptable deviation for maintaining the Ngg takeoff rotational speed?
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How is the Ngg CP calculated from Ngg takeoff?
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When should the EAMU readjust the gas generator RPM and TGT limitation control loops?
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What is the maximum EGT limitation at takeoff and contingency power?
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What altitude must the CP constant value be held to in ISA conditions?
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What triggers the output command for engine shutdown?
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What conditions must be satisfied to hold the TOP constant value to an altitude of 3800 m?
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What condition leads to the recording of the take-off power?
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What function does the BARK-78 perform when engine speed is reduced to 7% below maximum RPM?
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Which components are part of the SNK-78 system?
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When does the SNK-78 counter get energized?
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What is the purpose of the input/output device within SNK-78?
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What is the main purpose of the SNK-78 system?
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How does SNK-78 handle input signals to prevent damage?
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What occurs when the CP switch is turned ON in relation to the MKT-163 actuator?
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Which of the following describes the role of the computing device in SNK-78?
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What is the maximum air temperature allowed at the heater inlet for starting the heater in recirculation mode?
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What pressure does the fuel pump raise kerosene to after it has passed the solenoid valve?
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What is the function of the pressure regulator in the fuel flow path?
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In which direction does the heated air flow after leaving the combustion chamber?
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What should you do before switching the heater operation rating from automatic to manual?
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What must be done after an abortive start attempt of the heater?
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Which of the following conditions prohibits starting the heater?
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Which component increases the weight of the kerosene before reaching the injector?
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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.
