When Boeing named Dave Calhoun its chief executive in 2019, his mandate was clear: to navigate the company out of a reputational crisis after a pair of deadly crashes on its planes. But on Monday, Boeing announced that Mr. Calhoun would depart at the end of 2024 as the company tries to manage another safety crisis.

Here are some of the most notable episodes from Mr. Calhoun’s tenure, including the grounding of 737 Max jets, supply disruptions caused by the Covid-19 pandemic and the Jan. 5 incident this year in which a door panel blew off a Max jet at 16,000 feet.

December 2019

He takes over as planes sit idle.

Mr. Calhoun, who had been on Boeing’s board of directors since 2009, is named chief executive after the ouster of Dennis A. Muilenburg, the embattled leader who had been criticized for his handling of two crashes on Boeing Max 8 planes that killed nearly 350 people in 2018 and 2019. Max planes were grounded after those crashes.

A week before the company announces Mr. Calhoun’s new role, Boeing says that it is suspending global production of the Max. It had already cut production to 42 planes per month from 52.

March 2020

Invested “until they’re not.”

Two months into the job, Mr. Calhoun blames his predecessor for fostering a flawed internal culture. In an interview with New York Times reporters, Mr. Calhoun criticizes Mr. Muilenburg for boosting production rates to a level that compromised plane safety.

“Boards are invested in their C.E.O.s until they’re not,” Mr. Calhoun says.

“We had a backup plan,” he adds. “I am the backup plan.”