From 2010, he worked as a quality manager at the North Charleston plant making the 787 Dreamliner, a state-of-the-art airliner used mainly on long-haul routes.
In 2019, Mr Barnett told the BBC that under-pressure workers had been deliberately fitting sub-standard parts to aircraft on the production line.
He said soon after starting work in South Carolina he had become concerned that the push to get new aircraft built meant the assembly process was rushed and safety was compromised, something the company denied.
He said in some cases, sub-standard parts had even been removed from scrap bins and fitted to planes that were being built to prevent delays on the production line.
This follows an incident in early January when an unused emergency exit door blew off a brand-new Boeing 737 Max shortly after take-off from Portland International Airport.
A preliminary report from the US National Transportation Safety Board suggested that four key bolts, designed to hold the door securely in place, were not fitted.
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