TV3-117VM Series 3

TV3-117VM Series 03 turboshaft engine for civil helicopters

TV3-117VM Series 03 is a turboshaft aircraft engine with a free turbine, designed mainly for civil helicopters of the Mi-8 / Mi-17 family. The engine is a further development of the TV3-117 family and is intended to provide stable power output, fuel efficiency and reliable operation in a wide range of climatic conditions. It is used as part of the helicopter powerplant system and supplies mechanical power to the transmission. The Series 03 modification is especially relevant for helicopters operating in hot climates, high-altitude areas, dusty regions and other demanding environments.

Hot-and-high performance of TV3-117VM Series 03

The TV3-117VM Series 03 is optimized to retain power in hot and high-altitude conditions. Reduced air density and elevated ambient temperature normally reduce engine power margin, especially during takeoff, hover and one-engine-inoperative operation. This modification supports reliable operation on high-altitude landing sites and in hot climates where stable output is required for civil and transport helicopter missions. According to the provided technical data, the engine is capable of starting and stable operation on sites up to approximately 4000 m above sea level, depending on aircraft configuration and operating conditions.

Power modes of the TV3-117VM Series 03 engine

The TV3-117VM Series 03 provides several controlled power regimes for helicopter operation. Takeoff power is used for high-load flight phases, while nominal and cruise regimes support longer operation with controlled fuel consumption. Emergency power is used for abnormal conditions, including one-engine-inoperative situations, when the remaining engine must provide additional output for safe continuation of flight and landing. The use of all power modes must follow the engine and aircraft operating documentation, because power level, duration, gas temperature and environmental limits are controlled parameters.

Construction of TV3-117VM / VMA Series 03

The TV3-117VM / VMA Series 03 engine uses a single-shaft gas generator with a free power turbine. Its main gas path includes a 12-stage axial compressor, annular combustion chamber, two-stage compressor turbine, two-stage free turbine and exhaust unit. The engine also includes an accessory gearbox for installed units that support starting, fuel supply, lubrication, control and monitoring. The free-turbine configuration allows the power turbine to transmit torque to the helicopter transmission while the gas generator operates according to engine control requirements and load conditions.

Accessory equipment and support systems of TV3-117VM Series 03

The TV3-117VM Series 03 includes systems for anti-icing, lubrication and breather operation, fuel supply, automatic control, engine monitoring and starting. Installed accessories may include the NR-3VM fuel pump-regulator, SV-78BA air starter, DCN-70A centrifugal fuel pump, MA-78 oil unit, rotor speed sensor, manual turning mechanism, fuel manifold with 12 injectors, drain valve, compressor bleed valves, ignition unit and SP-26P ignition plugs. These units support stable engine operation during starting, acceleration, steady regimes and shutdown. Actual accessory configuration should be confirmed by engine documentation.

Application and interchangeability of TV3-117VM Series 03

The TV3-117VM Series 03 is intended for Mi-8 / Mi-17 family helicopters, including Mi-8MTV variants, Mi-17, Mi-171 and Mi-172, depending on approved aircraft configuration. The engine may be used on helicopters with single-rotor and coaxial rotor configurations where the applicable documentation permits installation. It supports operation with inlet particle separators and exhaust screening devices, preserving helicopter performance in dusty, smoky and maritime environments. The engine is described as interchangeable with earlier TV3-117 family modifications within approved limits, but exact interchangeability must be confirmed through service bulletins, aircraft records and engine documentation.

Product Type: Turboshaft aircraft engine with free turbine
Engine Designation: TV3-117VM Series 03
Alternative Designations: TV3-117VM Series 3, TV3-117VM / VMA Series 3, ТВ3-117ВМ серия 03, ТВ3-117ВМ серия 3
Function: Primary helicopter powerplant for civil and transport helicopters
Application / Where Used: Helicopter powerplant system
System / Installation Area: Engine installation / helicopter propulsion system
Compatible Aircraft / Equipment: Mi-8MTV, Mi-8MTV-1, Mi-8MTV-2, Mi-8MTV-5, Mi-17, Mi-171, Mi-172 and related Mi-8 / Mi-17 family helicopters
Engine Configuration: Single-shaft gas generator with free power turbine
Rotation Direction, Gas Generator Rotor: Counterclockwise
Rotation Direction, Free Turbine Rotor: Counterclockwise
Compressor Type: Axial
Number of Compressor Stages: 12
Combustion Chamber: Annular
Compressor Turbine: Two-stage
Free Turbine: Two-stage
Exhaust Unit: Installed
Accessory Gearbox: Installed
Emergency Power Mode: 2200 hp
Takeoff Power: 2000 hp
Nominal Power: 1700 hp
Cruise Power: 1500 hp
Specific Fuel Consumption: 0.220 kg/hp·h at takeoff mode
Compressor Pressure Ratio: 9.4
Airflow Through Compressor: Not less than 8.7 kg/s
Maximum Gas Temperature Before Turbine: 1263 K / 990 °C
High-Altitude Capability: Start and stable operation on sites up to approximately 4000 m above sea level
Power Retention: Maintains rated power in hot and high-altitude conditions
Environmental Resistance: Stable operation in dusty, smoky and maritime environments
Compatibility with IPS and Exhaust Devices: Supported
Length with Exhaust Pipe: 2055 mm
Width: 660 mm
Height: 728 mm
Dry Weight: 294–295 kg
Fuel Control Unit: NR-3VM pump-regulator
Air Starter: SV-78BA
Fuel Pump: DCN-70A centrifugal fuel pump
Oil Unit: MA-78 oil unit
Ignition Equipment: Ignition unit, including SK-22-2K type where applicable, and two SP-26P ignition plugs
Compressor Bleed Valves: Installed
Manual Turning Mechanism: Installed
Interchangeability: Interchangeable with earlier TV3-117 family modifications within approved limits
Maintenance: High maintainability and repairability
Time Between Overhaul: 1500 h
Assigned Service Life: Up to 3000–7500 h, depending on production year and applicable service bulletins
Condition: As applicable
Technical Documentation: Technical and operational documentation, passport, engine logbook, service bulletins and maintenance records, if available

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