Washington — The US Federal Aviation Administration said on Wednesday it was investigating production issues at Boeing’s 737 MAX factory, raised by an ex-manager who warned that schedule pressure and worker fatigue undermined quality and raised safety risks.

The manager, Ed Pierson, drew a link between faulty Angle of Attack sensors in two recent 737 MAX crashes that killed 346 people and what he called a “chaotic and alarming state” inside Boeing’s factory that undermined quality and safety...

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