June 17, 2016

"When United Launch Alliance’s (ULA) Atlas V rocket sent the OA-6 Cygnus cargo vessel, the S.S. Rick Husband, to the International Space Station (ISS) March 22, 2016, mission controllers detected an anomaly as the rocket headed into Earth orbit with its several tons of important supplies and equipment for the astronauts aboard the station."

SpaceFlightInsider: The aerospace company has now released a report on what occurred with that particular Atlas V launch. ULA also ensured the rocket is now ready for its next space launch on June 24. by Larry Klaes

'That booster will launch the U.S. Navy’s fifth Mobile User Objective System (MUOS-5) satellite, which was delayed more than a month due to the anomaly.

'As the first stage of the Atlas V underwent its planned burn during the OA-6 Cygnus mission, an oxidizer-rich blend of fuel flowed into the main engine. That caused the first stage to run out of liquid oxygen and shut down about six seconds prematurely.

'“The Atlas V’s robust system design, flight software, vehicle margins and propellant reserves enabled the successful outcome for this mission,” ULA stated in a June 15 press release. “The Centaur upper stage identified the first stage performance shortfall and compensated with an extended burn to deliver Cygnus to the precise orbit, well within the required accuracy.”

'The ULA engineering team, their engine supplier, and several government customers, formed a robust team to review the flight and operational data to determine direct and root causes and implement the appropriate corrective actions for future flights.'

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