Rosaviatsiya in April 2026 approved an increase in the assigned service life of the main parts of the TV7-117ST-01 turboprop engine for the Il-114-300 aircraft to 777 cycles. Over two years, the reliability of the powerplant was increased by 123%, Andrei Velichko, editor-in-chief of the Aviation of Russia portal, reported.
He explained that this metric is much more important than simply flight hours. A cycle ("takeoff-landing") creates peak temperatures and loads that degrade the properties of the metal. The more cycles the regulator allows, the longer the engine flies without major overhaul.
If in February 2024 the TV7-117ST-01 was allowed 348 cycles, then in April 2026 this figure reached 777. That is, the engine's reliability was improved by 123%.
For airlines, this means more stable planning of repairs and fleet utilization. For the Il-114-300, in the initial period the average daily flight time will be lower than that of aircraft of a comparable class with already established operational statistics.
As long as the engine service life remains low, the aircraft physically cannot fly much per day — otherwise it will quickly exhaust its cycle limit.
As the number of cycles increases, the Il-114-300 will be able to follow the path of the SSJ-100, that is, raise its average daily flight time from 4 hours to 8-10 hours, Velichko concluded.
Recall that the TV7-117ST-01 develops 3,100 hp at takeoff, and the AV112-114 propeller provides thrust of up to 4 tons. By many technical parameters, the powerplant surpasses foreign counterparts.