FAA orders temporary grounding of 737 MAX 9 aircraft after fuselage plug on Alaska Airlines appears to blow off in flight

(CNN) — The Federal Aviation is ordering the grounding of the model of Boeing plane involved in the Alaska Airlines blowout incident.

The FAA said the planes must be parked until emergency inspections are performed, which will “take around four to eight hours per aircraft.”

The order impacts 171 Boeing 737 MAX 9 jets, the agency approximates.

The MAX was famously subject to a nearly two-year grounding after two fatal crashes of its MAX 8 model involving a different flaw.

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Alaska Airlines has temporarily grounded its fleet of Boeing 737-9 Max aircraft after one of its planes made an emergency landing in Oregon on Friday, officials said – an incident that a passenger says involved a section of the plane blowing out in flight.

Alaska Airlines Flight 1282, which was headed from Portland to Ontario, California, returned safely to Portland International Airport around 5 p.m. PT after “the crew reported a pressurization issue,” the Federal Aviation Administration said.

A panel of the fuselage, including the panel’s window, popped off shortly after takeoff, passenger Kyle Rinker told CNN.

“It was really abrupt. Just got to altitude, and the window/wall just popped off and didn’t notice it until the oxygen masks came off,” Rinker said.

Firefighters were called to assess minor injuries after the landing, and no serious injuries were reported, the Port of Portland Fire Department said.

A passenger’s video posted to social media shows a side section of the fuselage, where a window would have been, missing – exposing passengers to the outside air. The video, which appears to have been taken from several rows behind the incident, shows oxygen masks deployed throughout the airplane, and least two people sitting near and just behind the missing section.

In a statement late Friday, Alaska Airlines said it was working with Boeing to understand what took place on Flight 1282. The aircraft is a 737-9 Max that received its certificate of airworthiness on October 25, 2023, according to the FAA.

The airline’s grounded fleet of 65 Boeing 737-9 aircraft is expected to undergo full maintenance and safety inspections over the next several days before being returned to service, the airline said.

“My heart goes out to those who were on this flight – I am so sorry for what you experienced,” Alaska Airlines CEO Ben Minicucci said in a statement.

Though the airline has acknowledged an incident on Friday’s Flight 1282, it has not detailed what the incident entailed. The plane “landed safely back at Portland International Airport with 171 guests and six crew members,” the airline said.

According to FlightAware, the flight was airborne for about 20 minutes. The plane departed from Portland International Airport around 5:07 p.m. local time and landed at 5:27 p.m.

‘A really loud bang… and a whoosh noise’

Evan Smith, a passenger on the flight, told CNN affiliate KPTV that he was sitting at least six rows in front of the section where the incident took place. “There was a really loud bang toward the rear of the plane and a whoosh noise and all of the masks dropped,” Smith said.

Emma Vu, another passenger, was asleep and woke up to a sensation of falling and seeing emergency masks drop down, she told CNN in a phone call. She apparently woke up after the panel section popped off; it wasn’t clear how close to the missing panel she was.

Vu said she texted her parents their code word for emergencies to let them know about the incident. “I’ve never had to use it before, but I knew that this was that moment,” Vu said.

People sitting on either side of her comforted her, she said. “The flight attendant came over too, and told me it was going to be OK,” Vu said. “The fact that everyone was kind of freaking out and she took that time to kind of make me feel like I was the only passenger – honestly that was really sweet.”

Vu plans to take a different flight to her intended destination on Saturday morning, she said.

The FAA and National Transportation Safety Board will investigate the incident, both agencies said.

In a statement to CNN, Boeing said it was aware of an incident involving Alaska Airlines Flight 1282 and was working to gather additional information.

Previous issues with Boeing’s 737 Max jets

CNN reported last month that Boeing has asked airlines to inspect all of their 737 Max jets for a potential loose bolt in the rudder system after an airline discovered a potential problem with a key part on two aircraft.

CNN transportation analyst Mary Schiavo said Saturday that issue probably had nothing to do with Friday’s incident. But, overall, the issues raise serious questions about Boeing quality control in manufacturing that the FAA must investigate, Schiavo said.

Boeing’s engineering and quality problems have posed major challenges for the company. The crashes of two of 737-8 Max jets that killed all 346 people on board the flights led to a crippling 20-month grounding of the plane. It also was one of the most expensive corporate tragedies in history, costing Boeing more than $20 billion.

The Max returned to the air carrying passengers in most markets around the globe beginning in late December 2020. But it has encountered other problems, including in April when Boeing said it has discovered a manufacturing issue with some 737 Max aircraft after a supplier used a “non-standard manufacturing process” during the installation of two fittings in the rear fuselage – although Boeing insisted the problem did not constitute a safety risk.

CNN’s Paradise Afshar and Tina Burnside contributed to this report.