The Odyssey launch platform and Sea Launch Commander control ship on the day before launch. Credit: Sea Launch

Mission details:

• Sea Launch closed the investigation into a Feb. 1 rocket failure Thursday, concurring with the conclusion of Russian and Ukrainian experts that the mishap was caused by a faulty hydraulic pump used to steer the Zenit 3SL booster in flight.
• The hydraulic power supply unit, known by its Russian acronym BIM, failed approximately 3.9 seconds after liftoff due to "abnormal performance" of the pump, which is supposed to pressurize the hydraulic oil supplied to the Zenit rocket's first stage engine gimbal actuators.
  During launch, the actuators pivot the Zenit's four-nozzle RD-171M first stage engine, directing the engine's thrust to guide the rocket on the proper trajectory.
• The rocket flew off course moments after lifting off from the Odyssey launch platform, a mobile launch pad positioned at the equator in the Pacific Ocean about 1,400 miles south of Hawaii.
• The rocket's on-board computer detected the launcher veering from the planned flight path, triggering an emergency engine shutdown sequence designed to safely terminate the launch in the event of a problem.
  The Zenit 3SL and its payload - the Intelsat 27 communications satellite - were lost when the rocket crashed into the Pacific Ocean a few miles from the launch site.
• The rocket's RD-171M main engine was built by NPO Energomash in Russia, and the Zenit's two main stages are manufactured by Yuzhmash in Ukraine.
• The Feb. 1 failure marked the fourth problematic launch in 35 flights from Sea Launch's ocean pad, and it was the first anomaly since the company emerged from Chapter 11 bankruptcy proceedings in 2010.