The F.A.A. said on Wednesday that it would not allow Boeing to expand production of any new planes in the 737 Max series, a linchpin of the company’s commercial plane business, until the agency was convinced that quality control had improved.
Mr. Calhoun suggested this month that a manufacturing lapse had been responsible for the door plug’s blowout. But it hadn’t been clear whether the lapse, which Mr. Calhoun referred to as a “quality escape,” occurred at Boeing’s factory in Renton or Spirit’s facility in Wichita, where the door plug was first installed.
The incident has raised fresh concerns about Boeing’s quality control among investors, airline executives, pilots, passengers and others in addition to regulators. Boeing’s share price has fallen 14 percent since the blowout.
In recent days, several airline executives have sharply criticized the company, a major supplier that they rarely complain about publicly.
“I am angry,” Ben Minicucci, the chief executive of Alaska Airlines, told NBC News on Tuesday, adding that the airline found loose bolts on “many” of its Max 9s. “My demand on Boeing is what are they going to do to improve their quality programs in-house.”