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Boeing 737's Harrowing Midair Incident Underscores MRO Importance

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Boeing 737’s Harrowing Midair Incident Underscores MRO Importance

Boeing 737 Max’s door which ripped off midair revealed a massive safety lapse — four key bolts meant to lock the door were missing.

Source: BBC


Boeing 737’s recent incident led to the US National Transportation Safety Board’s releasing initial findings from its probe into the incident on an Alaska Airlines plane in January. Four key bolts that were meant to lock the unused door to the fuselage appeared to be missing.

Replying to the report, Boeing said it was accountable for what happened. Boeing’s president Dave Calhoun said in a 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.”

The incident happened minutes after Alaska Airlines Flight 1282 took off, and involved a panel covering an unused emergency exit – known as a door plug. This suddenly blew out, leaving a gaping hole in the side of the main body of the aircraft, the fuselage.

The missing bolts appeared to have allowed the door panel to move out of position and break away from the aircraft, the report says. The harrowing incident occurred just moments after the flight took off from Portland International Airport. The plane then suffered a rapid loss of cabin pressure, as air rushed out and the atmosphere within the plane equalised with the thinner air outside.

The door plug was manufactured by Boeing’s supplier Spirit AeroSystems, and originally installed in the fuselage before being delivered to the aerospace giant. According to the preliminary report, this door plug was later removed in the factory due to damage that had occurred during the production process.

Photographic evidence suggests that when the plug was reinstalled, at least three of the four locking bolts were not put back in place. Damage to the door plug and its hinges, as well as a lack of damage to the areas where the bolts should have been, suggests that the bolts were missing before the door moved out of its normal position, the report said.

Spirit AeroSystems said it remain focused on working closely with Boeing and regulators “on continuous improvement in our processes and meeting the highest standards of safety, quality and reliability”. The findings are likely to make uncomfortable reading for Boeing, which has already faced harsh criticism over its corporate culture and quality control processes.

Inspections revealed loose bolts and fixings on other planes of the same specification, raising questions about the way they were built. However, BBC understands with inspections into the in-service 737-9s almost complete, no models have been found to be missing any of the four retention bolts.

Dave stressed Boeing’s improvement plan would “take significant, demonstrated action and transparency at every turn”. He added the airline manufacturer would implement new inspections of door plug assembly and fully document when the plug is removed. Additional inspections into the supply chain and an independent assessment would also be included in the plans.

“This added scrutiny – from ourselves, from our regulator and from our customers – will make us better. It’s that simple,” Dave said.

The revelations regarding loose bolts and fixings on planes of the same specification have undoubtedly raised concerns about manufacturing processes and quality control standards within the aviation industry. Boeing’s incident places Maintenance, Repair and Overhaul (MRO) back in the hot seat. It becomes imperative for the industry to prioritize safety, reliability, and accountability at every stage of aircraft maintenance and production. 

 

 

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