TV7-117
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Technical Specifications
- Dry Weight
- 520 kg
- Length
- 2,050 m
- First Run
- 1986
- In Service
- 1996
Klimov TV7-117
The TV7-117 is a Russian turboprop engine developed by the Klimov Corporation in Saint Petersburg, with a baseline rating of 2,800 shaft horsepower (SHP). Development began in the late Soviet period in 1986, and the engine entered service in 1996. It exists in two primary variants for distinct applications: the TV7-117S powering the Ilyushin Il-114-300 regional turboprop airliner, and the TV7-117ST (rated at 3,100 SHP) intended for the Ilyushin Il-112V military light transport. The TV7-117 represents Russia's primary indigenous turboprop development of the post-Soviet era.
Technical Specifications
| Parameter | Value |
|---|---|
| Shaft Horsepower | 2,800 SHP (TV7-117S); 3,100 SHP (TV7-117ST) |
| Dry Weight | 520 kg (1,146 lb) |
| Length | 2.050 m (80.71 in) |
| First Run | 1986 |
| Entry into Service | 1996 |
| Status | In Production |
Design and Propeller System
The TV7-117 is a free-turbine turboprop with separate gas generator and power turbine spools, following the same general architecture as the PW100 and PT6A families. The free-turbine arrangement allows the propeller speed to be optimized independently of gas generator speed, improving efficiency at partial power settings common in cruise and descent. The engine is paired with the AV-112 six-bladed propeller, a composite-blade unit designed for high efficiency at the cruise speeds targeted for the Il-114 — competitive with the regional jets increasingly displacing turboprops on similar-length routes.
Program History and Context
The TV7-117's development history reflects the turbulent trajectory of Russian aviation industry. Conceived in the Soviet era to modernize the regional aviation network, the program survived the Soviet collapse and economic chaos of the 1990s but proceeded slowly. The Il-114-300 program — the TV7-117S's primary application — was revived as a priority under Russian industrial policy seeking to reduce dependence on Western aircraft and engines following the 2014 sanctions environment and, more acutely, after 2022.
The TV7-117ST variant for the Il-112V military transport encountered significant developmental challenges, contributing to delays in the Il-112V program. The Il-112V experienced a fatal crash during flight testing in 2021, attributed to engine malfunction, which further complicated the path to operational service. Despite these setbacks, Klimov continues TV7-117 production and development as a strategic Russian turboprop asset, with the Il-114-300 program representing the most credible near-term path to serial production and airline service.