Previously Undetected Software Bug Potential Cause for Soyuz/Fregat Failure

The failure of a Soyuz 2-1B/Fregat-M rocket launching the Meteor-M 2-1 weather satellite and 18 international secondary payloads was traced back to a software bug on the rocket’s Fregat upper stage brought on by the unique parameters for Soyuz launches out of the Far Eastern Vostochny Cosmodrome.