Engine Problems Force Change To Juno Mission Plans

Engine Problems Delay Juno Engine Burn at Jupiter, SpaceRef

"Telemetry indicates that two helium check valves that play an important role in the firing of the spacecraft's main engine did not operate as expected during a command sequence that was initiated yesterday," said Rick Nybakken, Juno project manager at NASA's Jet Propulsion Laboratory in Pasadena, California. "The valves should have opened in a few seconds, but it took several minutes. We need to better understand this issue before moving forward with a burn of the main engine."

NASA's Juno Team to Discuss Jupiter Mission Status, Latest Science Results, NASA

"Team members of NASA's Juno mission to Jupiter will discuss the latest science results, an amateur imaging processing campaign, and the recent decision to postpone a scheduled burn of its main engine, during a media briefing at 4 p.m. EDT Wednesday, Oct. 19."

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