Roscosmos, Soyuz/Progress打ち上げ失敗の原因はエンジンが原因と発表

The panel of inquiry has arrived at the conclusion that the oxidizer tank of the third-stage engine was ripped open with an impact of fragments that emerged with the destruction of engine 11D55 as a result of combustion and further destruction of the oxidizer pump. The oxidizer pump may have caught fire for various reasons, such as the likely presence of foreign particles inside or violation of the engine 11D55’s assembly procedures (wrong clearance between parts or the rotor’s unbalance and runout). Defective workmanship manifested itself in flight," the report runs.