The National Transportation Safety Board released its preliminary findings Tuesday on an Alaska Airlines flight that was forced to make an emergency landing when a door panel fell off midair.

A picture of the Boeing 737 in a factory in Renton, Washington, showed the door panel that malfunctioned had no bolts installed in the door plug.

“Photo documentation obtained from Boeing shows evidence of the left-hand MED plug closed with no retention hardware (bolts) in the three visible locations,” the report said, using an acronym to refer to the middle exit door.

However, it was not clear what stage of the plane’s manufacturing the aircraft was in when the photo was taken.

The faulty plug was manufactured by Spirit AeroSystems Malaysia on March 24, 2023, and was received at Spirit AeroSystems Wichita on May 10, 2023, the report said. The plug was then installed and rigged on the Spirit AeroSystems Fuselage Line 8789 before it was shipped to Boeing on August 20, 2023. The fuselage arrived at Boeing’s Renton facility on August 31, 2023, according to the report.

In a statement Tuesday, Boeing said it appreciates the NTSB’s work and will review the findings “expeditiously” while continuing to cooperate with investigations from the NTSB and Federal Aviation Administration.

“Whatever final conclusions are reached, Boeing is accountable for what happened,” Boeing President and CEO Dave Calhoun said in the statement. “An event like this must not happen on an airplane that leaves our factory. We simply must do better for our customers and their passengers. We are implementing a comprehensive plan to strengthen quality and the confidence of our stakeholders. It will take significant, demonstrated action and transparency at every turn — and that is where we are squarely focused.”

The flight, carrying 177 people, left Portland, Oregon, Jan. 5 bound for Ontario International Airport in San Bernardino County, California, when the door plug blew off, leaving a gaping hole in the side of the aircraft. Many passengers described hearing a “loud bang” shortly after takeoff. A photo from one passenger showed a panel missing from the side of the fuselage.

The door plug from Alaska Airlines Flight 1282 lays on the ground in Portland, Ore.
The door plug from Alaska Airlines Flight 1282 lays on the ground in Portland, Ore.National Transportation Safety Board via AP

The Federal Aviation Administration grounded all 171 Boeing 737 Max 9 airplanes operating in the U.S. amid the NTSB’s investigation. The FAA also said it was increasing its oversight of Boeing production and manufacturing.

In his testimony to the House Transportation and Infrastructure Aviation Subcommittee on Tuesday, FAA Administrator Mike Whitaker offered more details on the increased scrutiny now underway at Boeing.

“We’re proposing to expand the oversight approach to include both audits and inspection which is why we’re moving inspectors into the facilities,” Whitaker said. “We know what we need to do next, which is to have more on-the-ground presence to verify what’s going on.”

Whitaker added the Jan. 5 incident has prompted the FAA to determine if there are any issues with production at Boeing.

“There have been issues in the past and they don’t seem to be getting resolved so we feel we need a heightened sense of oversight to get after that,” he said. “I think we’re gonna need more boots on the ground, we’re gonna need more inspectors. We don’t have many inspectors on the aircraft certification side of the house.”

Earlier this month, Alaska Airlines and United Airlines confirmed plans to return their fleet of Boeing 737 Max 9 planes to service. Alaska said in an earning report that it was preparing to complete inspections of its fleet and that each aircraft would be returned to service after passing inspection.

Several of the passengers on the flight where the door plug detached midair have sued Boeing. The class-action lawsuit claims that the company “delivered the subject 737 Max 9 to Alaska Airlines, Inc. without properly securing the (door) plug to the airframe,” and the bolts and seals used to install the panel were defective. They said the incident left them traumatized and physically injured.

The suit states that after the door plug fell off, the plane depressurized and “ripped the shirt off of a boy and sucked cell phones, other debris and much of the oxygen out of the aircraft.” The flight landed safely at Portland’s airport. The door plug has since been recovered and was sent to Washington as part of the NTSB’s investigation.

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