TV3-117VM Series 3

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.