The failure had been caused "by an unexpected design incompatibility" of the joint between the spacecraft and the rocket, said an online announcement published by press service of Roscosmos, citing the conclusion given by a special investigation commission set up following the failed cargo spacecraft launch.
The design incompatibility related to frequency-dynamic characteristics caused the spacecraft Progress to be emergently and uncontrollably separated from the third stage of the carrier rocket after the launch, the announcement said.
"This design feature was not fully taken into account at the trail stage of the creation of this space rocket complex (of Progress cargo spacecraft and carrier rocket's third stage)," Roscosmos said.
The mission failed as the spacecraft went into an uncontrolled spin in space and eventually kept dropping in orbit, which led to its re-entry into the atmosphere and burn-up on May 8.
By Ruchi Singh
reporter
Park Sae-jin
swatchsjp@ajunews.com
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