Engaged factory workers pull the chain to stop the entire line when they notice a defect.

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The Marine Corps variant (F-35B), a short take-off and vertical landing variant (STOVL), was grounded for nearly a month after a manufacturing defect caused a fuel line to detach just before a training flight in January.

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CNN: Legal Disclosures

The line, in the Penzing district of western Vienna, had been put under manual control following a technical defect, a spokeswoman for Austrian railways said.

BBC: Austrian trains in head-on crash