Trapped Cleaning Fluid Triggered Falcon Engine Shutdown

Falcon 9 launch.
Credit: SpaceX
CAPE CANAVERAL—The premature shutdown of one of nine Merlin engines that powered a SpaceX Falcon 9 rocket into orbit last month was caused by cleaning fluid trapped inside a sensor and igniting, SpaceX CEO Elon Musk said on April 22. Responding to a question about the engine shutdown on Twitter as...

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