International Launch Services (ILS) and Khrunichev State Research and Production Space Center (Khrunichev) announce that a Russian commission has convened and an investigation is underway to determine the root cause of the December 8 ILS Proton launch anomaly with the Yamal 402 satellite.

The anomaly occurred during the 4^th and final burn of the Breeze M engine during a planned 9 hour and 15 minute mission. The 4^th burn ended about four minutes early and the spacecraft was subsequently separated. The satellite had been built by Thales Alenia Space for Russian satellite operator, Gazprom Space Systems.

The Russian commission, convened by Khrunichev, will include independent experts from TsNIIMash (Central Scientific Research Institute of Machine Building), the leading institution of Roscosmos to support design, development and research into rocket and space articles, and M.V. Keldysh Research Center, the leading Russian entity for rocket engines. In parallel with the Russian commission, ILS will form its own Failure Review Oversight Board (FROB). The FROB will consist of representatives from ILS customers, insurance underwriters and technical experts from the industry. The FROB will review the commission’s findings and corrective action plan, in accordance with U.S. and Russian government export control regulations.

Additional information on the status of the investigation will be provided as it becomes available.