Russia’s S7 Technics Reports CFM56 Repair Ramp Up

Russian MRO provider S7 Technics completed repairs on 100 engines in 2025, its parent S7 Airlines said on Jan. 21. The company was certified by Russian authorities to provide overhauls of CFM56-5B/-7B turbofans in its facility at Moscow Sheremetyevo Airport.

In fall 2022, S7 Technics became the first Russian MRO to provide overhauls of CFM56 engines and Honeywell 131-9 auxiliary power units for Airbus A320 and Boeing 737NG family airliners, performing the work at Sheremetyevo.

In November 2025, the company put into operation a second CFM56 line at the facility. At that time, S7 said 380 engines had been repaired there since its opening. The figure included 63 turbofans for S7 with the vast majority for other Russian carriers.

Besides the engine shop at Sheremetyevo, S7 Technics provides CFM56 maintenance and restoration at its Moscow Domodedovo and Mineralnye Vody sites. In December 2025, authorities in Mineralnye Vody, located near the border with Georgia, said S7 planned to build a CFM56 engine test cell at its facility there which would be capable of testing 50 powerplants after repairs annually.

S7 also has an agreement with the Russian aero engine manufacturer, United Engine Corporation, to use its facilities for post-maintenance testing.

However, S7’s main rival, government-owned Aeroflot Group, certified its own CFM56 repair facility—Aero Thrust Technics—in October 2025. By the end of the year, that company had repaired three powerplants. Its capability is currently limited to high-pressure compressor rotor and stator repairs, high-pressure turbine repairs, and replacement of low-pressure turbine modules and the low-pressure compressor module assembly.

Russian airlines now operate about 340 CFM-56-powered A320 and 737NG family aircraft. They have not had access to foreign facilities for their repairs since 2022 following the imposition of Western sanctions in response to Moscow’s full-scale invasion of Ukraine.