UPS Crash Hearing Scrutinizes MD-11 Design Component

Day two of NTSB testimony reveals Boeing didn’t structurally require preventing engine pylon separation.

Meg Godlewski

Wednesday, May 20, 2026 at 02:47 PM ET

Verified

Edited By:

Travis Tingle

A UPS MD-11 aircraft [Credit: Shutterstock/Austin Deppe]

Key Takeaways:

The MD-11's pylon design did not structurally account for complete separation, and its "fail-safe" lugs failed simultaneously during the crash, raising NTSB questions about design philosophy and structural integrity definitions.
A critical spherical bearing on the engine pylon attachment was not considered a Principal Structural Element (PSE), resulting in infrequent inspection despite its known impact on lug integrity and previous service letters warning of potential issues.
The aircraft's engine fire warning system is designed to delay activation during takeoff, which prevented an immediate alert in the cockpit despite visible fire during the UPS Flight 2976 incident.

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Day two of the National Transportation Safety Board’s hearing on the fatal crash of UPS Flight 2976 on November 4 in Louisville, Kentucky, took a deeper dive into design and structural testing of the MD-11’s wing pylon and components.

According to Boeing, during the design of the aircraft the emphasis was on the pylon maintaining structural integrity in the event of a gear-up or off-airport landing and to prevent fuel spillage. Boeing officials noted there was no structural requirement to ensure pylon separation did not occur, as the scenario of the pylon completely separating from the wing was not considered.