most reliable Maintainable engine ,with more than 7000,000 safe flying hours with a long MTBF( 3 in 100,000 FH)
| Motorsich the largest engine manufacturer of Ex-Soviet Union and one of the largest Aero-Engine maker in the world produces TV3-117 VMA-SBM1 with TBO of more than 4000 hours and a life exceeding 20,000 flying hours |
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Motorsich the largestengine manufacture of Exsoviet Union and one of the largest Aero-Engine maker in the world produces TV3-117 VMA-SBM1 wich is superior to to canadian PW127 with TBO of more than 4000 hours and a life exceeding 20,000 flying hours
A most reliable maintainable engine, with more than 7000 ,000 safe flying hours with a long MTBF ( 3 in 100,000 FH )
| Horse Power of Take off | 2500 H.P |
| Horse Power of Cruise | 1750 H.P |
| S.F.C at Take off | 0.206 Kg/c.hp.h |
| S.F.C at Cruise | 0.193 kg/c.hp.h |
| Dry Weight | 570 Kg |
POWER PLANT
Aircraft power plant consist two engine units, with TV3-117VMA-SBM1 engines and air propellers AV-140, located in the nacelle on wing, as well as systems, providing their operation: oil system, engines starting, SU-140 electricpower unit, power unit control system.
TV3-117VMA-CBM1 engine is jetprop one, consisting of gas turbine drive and reducer. Gas turbine drive consists of the following units:
| - inlet section; | - exhaust pipe; |
| - axial flow compressor; | - central drive; |
| - combustion chamber; | - box of engine units. |
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Reducer consists of rear and front reducers and connected shaft lead. AN-140 aircrew is fastened to front reducer screw shaft flange, jointly operated with the engine. Generator 3003-140, the maine source of electric power 155/200 V, alternative frequency, is installed on each engine. Air bleed out of each engine at all operation modes is provided for needs of aircraft systems. AN-140 aircrew is single, feathering-reverse, forward-mounted, and has 6 blades. Aircrew serves to transform engine torque to thrust, required for aircraft flight, to break when landing run and maneuvering on the ground. Airscrew selected speed at all modes are maintained automatically with POB-34M airscrew constant requlator and RED-2000 electronic regulator due to change of unit blades angle. Oil system of each engine is autonomous, circulated under pressure and provides engine parts lubrication and heat rejection from bearings of all support, gears of engine units box, front and rear reducers, as well as venting of engine supports oil cavity. |
All assemblies oil system are mounted on the engine. Oil tank is located left side looking forward and is attached to the shaft wire. Tank filling can be made in open way through the throat or in closed way through pipe connection of airborne filling. Engines use oils: main LZ-240/TU301-04-010-92/, doubling - B-3B/TU38101295-85A. Engine start system is air, automatic and consists of electronic, air and fuel systems. Control electronic system ensives assemblies automatic engagement, providing starting by selected cyclogramme, regulates supply of starting and operating fuel, ignition system.
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Air system provides overspeeding of compressor rotor up to speed, required for engine start. Compressed air sources for operation of SV-78SB2 air starter on the ground are:
| - airborne auxiliary power unit; | - aircraft engine being operated; | - ground starting unit. |
Fuel system units at starting mode provides supplying starting and operating fuel in compliance with monitoring signals of electronic regulator RED-2000.
Electronic digital system of power unit control ESU SU-140 contains:
- BUK-140 power unit control unit: two auto flight control systems SAU-2000, (one for each engine unit DU). SAU-2000 consists of electronic part RED-2000 and hydromechanical part, including units NR-2000, RT-2000, RSV-34M7 The system provides:
-fuel supply, automatic support and regulation of engine parameters acc. to selected laws at all transitive and set operational modes;
- output of data signals, proportional to engine parameters in BUK control unit and monitoring signals to switching and starting unit;
- protection of engine by limit operation parameters values and when failure.
Power unit control system provides data reception from transmitters and warning indicators, installed on engine units No. 1, 2 to RED-2000 regulators, which performs primary processing, converting and output of data, digital code to BUK-140 control unit.
RED-2000 regulators and engines operation mode are set with help of levers of engine control system and controls on panels in crew cabin. Parameters of engines and systems operation inspection:
| - OBOROT TK gas generator rotation speed; | - angle of IKMRT levers of engine control system installation; |
| - OBOROT CT free turbine rotation speed; | - oil tank temperature (toC) and oil pressure (P kgf/cm2) in engine “OIL” oil system; |
| - gas temperature in front of TVG compressor turbine; | - vibration “VIBR” rotor of “TR” gas generator “TR” and aircrew “VINT”set to relevant indicators, located on middle panel of pilots instrument board. |
| - IKMRT aircrew shaft torque; |
Auxiliary power unit of aircraft AN-140 APU is auxiliary electrical power generation, providing:
| - TV3-117VMA-SBM1 engines air starting on the airfields, located at altitudes up to 4000 m and in flight at altitudes up to 4000m; | - generation of compressed air for aircraft air conditioning system; | -power supply of aircraft A.C. electrical system. |
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