Now Boeing is to know how to fix the jet, and how to fix its reputation.
The 737 Max jets are now the most important product for the company. There are orders for nearly 5,000 jets, enough to maintain production lines running for the coming years. But none of the 371
A search for crash causes  The reason for the crash of Ethiopian Airlines is still unclear. But it was like another deadly accident involving 737 Max in late October, when a Lion Air flight in Indonesia crashed, all killed.
An initial investigation found that Lion Air pilots had been working to control the plane. An automatic safety measure forced airplane nose because it was wrong the thought of the plane was at risk of going to a stall. The FAA said on Wednesday that grounding was justified when new data was released that the track of Etyopian Airlines flight fit in the same order of Lion Air flight.
Boeing and the FAA insist on proper training that pilots can overcome any problems with safety systems, and the airplanes may continue as a software upgrade transfers. This upgrade is expected to be available next month.
But as other aviation authorities around the world base the jets from Sunday to Wednesday morning, the pressure was built on the FAA and Boeing to act faster.
How to fix the planes
"Technology is a headache, but it can not be overcome. Damage to reputation is the biggest challenge everyone," says Richard Aboulafia, vice president of studying the Teal Group.
How long the planes to stay on the ground are still uncertain, "but our prediction is weeks and months," says Cowen aerospace analyst Cai Von Rumohr on a note to investors.
Previous crisis for Boeing
Aboulafia said that Boeing had worsened the worsening crisis before.
The rush of air travel into the airline industry after the September 11, 2001 attacks was a bigger threat because it was not clear whether or when the need for air travel would return . All US airlines require supplies to survive this downturn.
A lithium battery problem that led to the 787 Dreamliner base for three months in 2013 is also a bigger problem.
"Here you have headline tragedy, the terror of 300 deaths," said Aboulafia. "But for Boeing, the Dreamliner is like scarier because we do not know how to fix it, and the consequences of not being able to fix it are devastating."
Von Rumohr said another Boeing plane, 727, had four deadly crashes in seven months between 1965 and 1966, soon after its introduction.
The problem is a training issue, and not mechanical. Pilots are not familiar with the configuration of three engines.
"It seems like it can not be recovered from there. Travel agents say customers fly at anything but a 727. It returns from it to become one of the most successful aircraft," Von said. Rumohr in CNN Business.
Boeing's financial health
The company posted $ 101 billion in revenues last year, and $ 10.6 billion in revenues.