NTSB probes why a UPS jet lost an engine and crashed on takeoff

NTSB investigates cause of UPS jet engine failure and crash

NTSB probes why a UPS jet lost – The National Transportation Safety Board (NTSB) held a two-day inquiry on Tuesday to examine the circumstances surrounding a UPS McDonnell Douglas MD-11F jet that lost an engine and crashed shortly after takeoff from Louisville, Kentucky, last year. This event, which claimed lives and raised questions about aircraft safety protocols, is now under scrutiny by the board to uncover the root causes and prevent similar incidents in the future.

Tragedy on the Runway

On November 4, UPS flight 2976, a cargo plane en route to Hawaii, suffered a catastrophic engine failure moments after departing from Louisville Muhammad Ali International Airport. The crash sent flames and wreckage spreading for over half a mile, with black smoke rising dramatically into the atmosphere. The incident resulted in the deaths of 15 individuals, including the three crew members aboard the aircraft and one person who later succumbed to injuries sustained in the crash, 51 days after the event.

In addition to the fatalities, 23 people on the ground were injured during the accident. The MD-11F, a 34-year-old aircraft equipped with three engines—two mounted on the wings and one positioned on the tail—was involved in the crash. Despite its age, the plane had been deemed safe for operation by the Federal Aviation Administration (FAA) just days prior to the incident. Now, the NTSB is seeking answers by interrogating witnesses, including representatives from UPS, the pilot’s union, Boeing, and the FAA, to determine what led to the engine’s detachment.

Structural Failure Under Scrutiny

According to NTSB findings, the crash was caused by the structural fittings that connected the left engine to the wing fracturing. The engine was secured via a mount containing a spherical bearing, known as a bearing race, enclosed within brackets called lugs. Investigators revealed that the bearing race cracked due to fatigue, leading to its separation from the lugs. This failure shifted abnormal stress onto the remaining components, causing them to break and allowing the engine to fall from the wing.

“We issue safety recommendations … they are to be taken seriously,” stated Jennifer Homendy, chairwoman of the NTSB. “Those recommendations are aimed, they’re comprehensive, they’re extensive, and they’re aimed at preventing another tragedy. If they’re not implemented … we will be here again.”

The NTSB’s hearing, which lasted more than 10 hours, focused on various aspects of fleet safety, including how maintenance anomalies are identified and reported. It also explored the FAA’s and Boeing’s ongoing operational safety programs and their communication strategies when issues are detected. During the proceedings, the board presented an animated depiction of the engine-to-wing attachment design and its failure sequence, offering a visual breakdown of the mechanical breakdown.

Questions About Preventive Measures

One of the central topics of the investigation was whether the structural flaws could have been identified earlier. Records indicate that nine reports of bearing race problems were submitted to Boeing before the crash, yet these were not deemed critical enough to warrant additional inspections. “There was a misunderstanding initially, 20 years ago, about the severity of the event that might result from failure of this bearing,” explained FAA spokesperson Melanie Violette. “If broken, that bearing might cause some damage to the lug, but it was not believed to be critical to the integrity, the safety of the aircraft.”

UPS representatives, including David Springer, senior director of engineering and technical operations at UPS Airlines, testified that the company might have taken different actions if it had fully understood the implications of the bearing race’s failure. “We have a bearing fracture, and it slides out, it migrates a little bit,” Springer said. “It’s not a big deal. The rest of the damage that was being caused was a big deal. I think if we would have known that at UPS, I think we would have asked a lot of different questions over the years.”

Impact and Aftermath

The crash’s aftermath has been deeply felt, not only by the victims’ families but also by the aviation community. Homendy emphasized the emotional toll of such tragedies, noting that the “invisible injuries” experienced by survivors and loved ones can have lasting effects. “This accident, just like others, undoubtedly caused invisible injuries that aren’t reflected in the numbers we provide,” she said. “Psychological and emotional trauma from being physically injured, witnessing an accident, or losing a loved one can have a profound impact on lives and livelihoods.”

The crash occurred during a flight originally scheduled on a different aircraft. A fuel leak detected during a routine pre-flight inspection forced the replacement of the plane with the MD-11F. This decision, while standard in aviation, highlights the importance of rigorous maintenance checks. The animation presented during the hearing illustrated the engine’s detachment, showing it separating from the wing and soaring upward before plummeting onto the runway. The plane, which only reached about 30 feet in altitude, crashed into a warehouse, storage yard, and petroleum recycling facility just outside the airport, exacerbating the damage and casualties.

Broader Implications for Safety Protocols

The NTSB’s findings have sparked renewed debate about the FAA’s oversight and Boeing’s design standards. While the FAA had approved the MD-11F’s return to service, the agency’s earlier assessment of the bearing race’s risk appears to have underestimated its potential impact. The board’s presentation of the animation and technical details underscores the need for more thorough evaluations of aircraft components, especially those critical to structural stability.

As the investigation unfolds, the NTSB is emphasizing the importance of transparency and proactive measures in aviation safety. The hearing’s focus on maintenance reporting and communication gaps between manufacturers, airlines, and regulatory bodies reflects a broader effort to ensure that no safety issue is overlooked. With the crash having occurred on a 34-year-old plane, questions about aging aircraft and their maintenance schedules are now central to the discussion.

The incident also raises concerns about how safety recommendations are prioritized and implemented. Homendy’s remarks during the hearing serve as a reminder that the NTSB’s role is not just to investigate but to advocate for systemic changes that prevent future accidents. As the board continues its inquiry, the findings are expected to influence policies and practices across the aviation industry, potentially leading to updated safety standards and enhanced inspection protocols.

In the days following the crash, UPS swiftly grounded its MD-11 fleet, and the FAA followed suit, halting operations for all similar aircraft. This decision reflects the urgency with which safety concerns are addressed once they are confirmed. The NTSB’s probe aims to ensure that the lessons learned from this tragedy are applied effectively, safeguarding both passengers and crew in the years ahead.

Looking Ahead

As the hearing concludes, the focus shifts to the broader implications of the crash. The NTSB’s recommendations, if adopted, could lead to significant improvements in aircraft design and maintenance procedures. The incident serves as a stark reminder of the critical role each component plays in ensuring safe flight operations. With the emotional and physical toll of the crash still fresh, the board’s work is essential in building a safer future for air travel.