Changing CEOs was the easy part. Now it’s up to Boeing’s new leader to deal with a crisis caused by two crashes and the grounding of the company’s bestselling plane. David Calhoun took over Monday as Boeing’s third CEO in the last five years, following the firing last month of Dennis Muilenburg.

Calhoun will oversee Boeing’s legal strategy as it deals with dozens of lawsuits by families of the 346 people who died in crashes of the 737 Max jetliner. Calhoun’s to-do-list also includes repairing Boeing’s strained relationship with its chief regulator, and overseeing compensation to airline customers who cancelled thousands of flights because their Boeing jets were grounded.

Maybe most significantly, he must try to restore the company’s battered reputation and the impression that it put profit over safety.

In an email to employees, which Boeing made available to the public, Calhoun spelled out several priorities for 2020. First, he wrote, is safely returning the Max to service, followed by restoring trust in the company.

“This is a crucial time for Boeing,” Calhoun said. “I see greatness in this company, but I also see opportunities to be better. Much better.”

Calhoun said he will spend his first weeks as CEO listening to employees, customers and regulators and assuring them Boeing is on the way to meeting their expectations. Boeing declined to make him available for interviews.

Calhoun is an experienced executive who once ran General Electric’s jet-engine business and served as chairman of the Boeing board for 10 years. His fellow directors described him Monday as the right fit for CEO.

Boeing is halting Max production until it knows when the Federal Aviation Administration will approve fixes that company engineers are making to the plane’s software and other systems. While Boeing says it will find other work for idled employees, employees at major suppliers are not so lucky. Spirit AeroSystems, which makes fuselages for the Max, said Friday it will lay off 2,800 people.

Boeing is so big that the loss of exports from the Max grounding is weighing on the entire US economy.

“There is no question that the Boeing situation, it is going to slow down the GDP numbers,” Treasury Secretary Steven Mnuchin said Sunday, referring to the measure of economic growth. “Boeing is one of the largest exporters, and with the 737 Max, I think that could impact GDP as much as 50 basis points this year.”

Fifty basis points is one-half of one percentage point. Mnuchin said on Fox News that Boeing could reduce US economic growth in 2020 from around 3% (higher than many private economists forecast) to 2.5%.

In the latest black eye for Boeing, a new batch of documents released last week appeared to show that employees hid safety problems from regulators and doubted the safety of the Max while it was in development.

“This airplane is designed by clowns who in turn are supervised by monkeys,” one employee wrote.

In another exchange, two unidentified employees agreed that they would not put their families on a Max.

It is not clear when regulators will let the Max fly again. Officials who are investigating crashes in Indonesia and Ethiopia have focused on flight control software that was not included on previous versions of the 737. Before both crashes, the software pushed down the plane’s nose based on a faulty readings from a single sensor.

More recently, questions have arisen about other problems on the Max including wiring bundles that could be too close together, raising a potential risk of fire. Separately, the FAA has in recent weeks announced it wants to fine Boeing $9.3 million for installing substandard parts on the wings of some Max jets and other 737s – more than 300 planes in all.

Boeing’s problems aren’t limited to jetliners, either. Last month a Boeing spacecraft that was to dock with the International Space Station flunked its mission when it couldn’t reach the right orbit above Earth.

Boeing announced on Dec. 23 that it would replace Muilenburg. An interim CEO took over for three weeks while Calhoun, who was most recently a private-equity executive, cut ties to other companies.

Calhoun, 62, will get a base salary of $1.4 million but potentially several million more in bonuses and stock awards, including $7 million if he gets the Max back in service.