But the repercussions for Boeing are expected to be limited.
On Saturday, the US Federal Aviation Administration ordered 171 aircraft of this type to be grounded to undergo inspections.
The order was issued after an accident on Friday when a Boeing 737 MAX 9 operated by Alaska Airlines was forced to make an emergency landing after part of a door broke off during a flight from Portland, Oregon, to Ontario, in Southern California.
The video recording of the incident was spread around the world, which showed a gap in one side of the plane while air flowed into the cabin and oxygen masks hung from the ceiling. But no one was seriously injured.
An investigation by the National Transportation Safety Board has begun, and the nature of the malfunction that occurred in the plane has not yet become clear, in which a panel used to fill the gap in the emergency exit located in the middle section of planes with a smaller number of seats was torn out.
The US Aviation Administration announced on Sunday evening that the door that broke off on Friday was found in the garden of a private home in Portland, Oregon.
This accident represents the latest in a series of setbacks that Boeing suffered, after two crashes of two 737 MAX planes in October 2018 and March 2019, killing a total of 346 people.
The two incidents, linked to software within the plane's stabilization system called the Maneuvering Characteristics Enhancement System, grounded all 737 MAX aircraft for nearly two years.
But Boeing faces other difficulties as well, as it has suspended deliveries of its long-haul 787 aircraft several times over two years due to manufacturing and inspection defects.
Recently, problems came from the 737 MAX planes, and last fall, defects were discovered in the plane’s rear bulkhead.
In December, it was revealed that there was a risk of loosening of the screws in the navigation system.
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