May 25, 2015

Roscosmos didn’t announced specified data on Progress M-27M cargo vehicle accident on Friday, Commission well need more time, – space agency press office reports.

“Special Interdepartmental commission investigating accident of Proton M-27M  launched from Baikonur spaceport on April 28, 2015, goes on working, final conclusions will be presented later”, – official message says.

Soyuz-2.1a modernized booster with Progress m-28M cargo vehicle was launched from Baikonur spaceport on April 28. Thevehicle separated from the booster’s third stage off-nominally, the vehicle entered unscheduled orbit spinning at that. The docking on the vehicle with the ISS had to be cancelled. All efforts to take control over the vehicle were a failure:  Progress started uncontrolled descent. On May 8, 05.04 progress M-27 ceased to exist above the central region of the Pacific Ocean.

According to the preliminary data already presented by Roscosmos Progress M-27M was lost because oxidizer tank depressurization and further Soyuz-2.1a booster 3rd stage fuel tank  depressurization. It was the commission to find out depressurization cause.

To determine the nature of the cause additional modeling and a series of experiments on the premises of aerospace industries were needed.

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