A recent investigation by the US National Transportation Safety Board (NTSB) revealed that Boeing was aware of a structural flaw in the MD-11F freighter that crashed in Kentucky in November, killing fifteen people. The issue involved cracks in the engine mounting assembly, which Boeing identified 15 years ago. Despite this knowledge, Boeing concluded that the flaw would not impact flight safety.

The NTSB's findings are troubling, as they indicate that Boeing had previously discovered similar failures on four occasions. In 2011, the company issued a non-binding "service letter" to operators, recommending a visual inspection every five years. This incident raises questions about Boeing's internal processes, especially following past controversies with the 737 Max and recent quality control issues.

Critics argue that Boeing's handling of the situation was inadequate, given the critical nature of the engine attachment mechanism. The NTSB's ongoing investigation may lead to further scrutiny of Boeing's safety protocols and maintenance recommendations. Aviation safety experts are watching closely to see if this incident prompts changes in how Boeing addresses potential safety issues.