Boeing CEO David Calhoun will step down from the embattled plane maker at the end of the year as part of a broader management shakeup after a series of mishaps at one of America’s most storied manufacturers.

Stan Deal, president and CEO of Boeing’s commercial airplanes unit, will retire immediately, with Stephanie Pope, the company’s chief operating officer, to lead the division.

The company said board Chairman Lawrence Kellner does not plan to stand for re-election in May.

Boeing has been under intense pressure since early January, when a panel blew off a brand-new Alaska Airlines 737 Max. Investigators say bolts that help keep the panel in place were missing after repair work at the Boeing factory.

The Federal Aviation Administration has stepped up its scrutiny of the company, including putting a limit on production of 737s. An FAA audit of Boeing’s 737 factory near Seattle gave the company failing grades on nearly three dozen aspects of production.

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Airline executives have expressed their frustration with the company, and even seemingly minor incidents involving Boeing jets have attracted extra attention.

Fallout from the January 5 blowout has raised scrutiny of Boeing to its highest level since two Boeing 737 Max jets crashed in 2018 in Indonesia and 2019 in Ethiopia. In all, the crashes killed 346 people.

In a note on Monday to employees, Calhoun, 67, called the accident “a watershed moment for Boeing” that requires “a total commitment to safety and quality at every level of our company.”