KOMsomolsk-on-Amur, Russia — April 12, 2026 : A fire has been reported at the Komsomolsk-on-Amur Aviation Plant (KnAAZ), a key production facility in Russia’s Far East responsible for manufacturing advanced combat aircraft, including the Su-57 fifth-generation fighter and the Su-35S multirole fighter.
The incident occurred at the plant’s Workshop No. 46, according to open-source intelligence assessments. Initial footage of the fire was circulated on social media by the Telegram channel Exilenova+, after which analysts from the CyberBoroshno community conducted geolocation analysis and identified the affected structure as the composite materials workshop.
Composite Manufacturing Facility Identified as Impacted Area
Workshop No. 46 plays a central role in the production of polymer composite material (PCM) components used in Sukhoi aircraft. Technical assessments indicate that the facility manufactures approximately 300 types of composite parts for the Su-57 program, including around 100 large structural elements.
These components include aileron panels, air intake structures, flaperons, fuselage flooring sections, and outer wing tips—elements essential to both aerodynamic performance and structural integrity. The Su-57 relies extensively on such composite materials to reduce radar cross-section and overall weight, making the workshop a critical node in its production chain.
Manufacturing processes within Workshop No. 46 are largely manual due to the precision required in composite layup and curing. While partial automation was introduced in 2016, including the integration of a laser-based material marking system, the production environment continues to depend on skilled technicians and controlled fabrication conditions. This specialization limits the ability to rapidly replicate the facility’s output elsewhere.
Greater Impact Expected on Su-57 Production
Although the workshop supports both Su-35S and Su-57 production lines, analysts assess that disruption to composite manufacturing will have a disproportionately greater effect on the Su-57 program. Compared to the Su-35S and earlier Su-30MK2 platforms, the Su-57 incorporates a significantly higher proportion of composite structures.
Industry estimates indicate that producing a full set of composite components for a single Su-57 requires approximately eight times more labor than for a Su-35S. As a result, any sustained interruption at Workshop No. 46 could slow or temporarily halt final airframe assembly for the fifth-generation fighter.
While production loads could theoretically be redistributed to other domestic facilities, including ONPP Technologiya, analysts note that such measures would only partially compensate for lost capacity and are likely to introduce scheduling delays.
Production Context and Fleet Status
The fire comes at a time when KnAAZ is operating at full capacity to meet a long-term state defense order announced in 2024, with deliveries scheduled through 2030. The plant has been working under constraints linked to Western sanctions, which have increased reliance on domestically sourced materials and manufacturing systems.
Available production data indicates that in 2025 the plant delivered seven batches of Su-35S fighters. While official batch sizes are not publicly disclosed, industry estimates suggest each batch includes two to three aircraft. In the same year, two Su-57 aircraft were delivered to the Russian Armed Forces.
The total number of Su-57 aircraft produced to date, including prototypes, is estimated at between 20 and 25 units. The fleet previously sustained damage in June 2024, when two Su-57 aircraft were reportedly affected by a Ukrainian drone strike at an airbase. The repair status of those aircraft has not been publicly confirmed.
Lack of Official Confirmation on Cause and Damage
As of April 12, 2026, Russian authorities, including KnAAZ, the Sukhoi Company, the United Aircraft Corporation (UAC), and emergency services, have not issued official statements regarding the cause of the fire or the extent of damage to Workshop No. 46 and its equipment.
The Komsomolsk-on-Amur Aviation Plant, named after Yuri Gagarin, remains the only facility in Russia certified for serial production of the Su-57. It operates as part of the United Aircraft Corporation under the Rostec state conglomerate and is a central component of Russia’s military aviation manufacturing infrastructure.
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