Boeing 737 Max 9 airframe accident triggers investigation

In the aerospace industry, recent incidents involving Boeing’s 737 Max 9 aircraft have prompted a thorough investigation into the manufacturing and installation processes of airframe components. The plane, Boeing’s latest single-aisle model that can seat up to 220 passengers, exploded on Friday. The incident occurred on a flight operated by Alaska Airlines when a door replacement panel was lost. Although the damage was severe, the flight fortunately landed safely.

Spirit AeroSystems, listed on the New York Stock Exchange under the ticker NYSE: SPR, is responsible for the initial production and installation of related airframe components. However, Boeing Co. NYSE:BA also plays a key role in completing these components. The incident raises questions about where potential vulnerabilities could be introduced in the assembly process, given the complex two-stage installation process involving the Spirit plant in Wichita, Kan., and the Boeing Machinery plant near Seattle.

Most of Boeing’s 737 MAX 9 aircraft were grounded on Saturday for safety inspections after problems were discovered after eight weeks of use. This model has an optional side door to accommodate evacuation requirements when equipped with the maximum seating configuration. However, many airlines select fewer seats and therefore do not need this extra door, then disable it and replace it with a “plug” to maintain the integrity of the aircraft.

The production process involves Spirit AeroSystems building 737 fuselages with special door assemblies that are only partially installed and then sent to Boeing’s factory in Renton, Washington. There, the non-functioning door is removed to make it easier to load the interior, then the part is reinstalled and the installation is completed. The airframe is then pressurized to 150% of normal levels to ensure normal operation.

The investigation into the explosion will involve structural experts who will determine whether design or manufacturing issues contributed to the accident. This type of door stopper has been a popular feature in the industry for years, allowing for flexible cabin layouts.

Reuters contributed to this article.

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