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A SeaLaunch Zenit launch vehicle experienced an 'unusual' event during the 31 May launch of Intelsat 19. Despite reaching its assigned transfer orbit, the Space Systems Loral LS-1300-based satellite fully deployed only one of its two solar arrays.
"Boeing engineers did note an unexpected, isolated event around 72sec after launch, which registered on microphones and pressure sensors," says Energia, which SeaLaunch contracts to deliver and launch the vehicles. "We have only seen this one other time out of the 31 flights and while it is premature to speculate on its origin until further analysis is complete, it bears a striking resemblance to a prior Space Systems/Loral mission."
"The data available on Intelsat-19 very clearly indicates that this is not the same issue that we had last year," says Intelsat. "Not including Intelsat 19, five more 1300 satellites have been launched with ten successful solar array wing deployments