Ukraine’s Military Intelligence Directorate said Russia lost a Su-57 on Thursday, Oct. 29, at Akhtubinsk airfield in the Astrakhan region after an engine startup failure. The report places Russian Su-57 Fighter Destruction in the middle of a fighter fleet that Moscow has tried to keep tightly protected.
The loss matters because HUR says the aircraft was one of Russia’s most advanced in-service fighters and would be the fourth Su-57 Russia has lost this year. The Su-57 first flew in 2010, serial production began in 2019, and Russia had around 32 Su-57s, including prototypes, against the 76 originally envisioned.
Akhtubinsk airfield wreckage
A Ukrainian monitoring channel shared a satellite image on Friday showing wreckage resembling a Su-57 at Akhtubinsk airfield. HUR then said in a press release on Monday that the aircraft was lost during engine start-up. The image and the statement give the loss a narrow time window: the aircraft was lost on Thursday, the wreckage image followed on Friday, and the intelligence release came on Monday.
HUR said the Su-57 is equipped with an AL-41F1 turbojet engine, also called Izdeliye 117, and said one reason engines of this type can explode or suffer catastrophic failure is poor-quality fuel. That detail pushes the story beyond a simple crash claim and into the mechanics of how ground handling can end a flight before takeoff.
Russia fuel standards
HUR suspected subpar jet fuel quality caused the incident. The same reporting says Russia lowered jet fuel standards in August to allow a freezing point of -50°C instead of the previous -60°C, and that civilian airports in Russia imposed fuel rations in September. Those two changes sit close enough to the Oct. 29 loss to raise the fuel question, but the report does not link the August rule change directly to this specific engine failure.
HUR also said Russia imported jet fuel and gasoline from third countries, including India. That leaves the Su-57 loss tied not just to one aircraft at one airfield, but to the larger strain on Russia’s fuel supply chain and the standards used to keep military aviation running.
Su-57 losses this year
The Su-57 is Russia’s premier fifth-generation multirole fighter and its most advanced aircraft currently in service. A loss of this type is more than a routine airframe write-off because the fleet is small, production has been slow relative to the original plan, and each loss cuts into a limited inventory.
The unresolved point is whether the lowered fuel standard directly caused the engine startup failure at Akhtubinsk airfield or whether the fuel problem was only part of the wider pressure on Russia’s aviation system. For now, the clearest fact is that Russia lost another Su-57 on Oct. 29, and HUR says the fire began before the aircraft ever left the ground.
