https://www.military.com/daily-news...causing-osprey-clutch-failures-2010.html

sample quote

An effort to redesign the input quills first kicked off in 2017 though it would fail three years later in 2020, the document explained. Another redesign effort began in 2022 and continues to this day. However, neither effort included an actual fix, and the cause of HCEs is still unknown.

Complicating these efforts is the fact that, according to the Marine Corps document, the service hasn't been successful in recreating an HCE in a lab environment where they could document the exact chain of events that causes the problem.

A double HCE -- the kind of incident that downed Swift 11 -- is even harder to duplicate. In fact, the document makes clear that at the time Swift 11 went down, the Corps wasn't aware that such a thing was even possible. The service hadn't seen any models or simulations that suggested that both of the aircraft's clutch assemblies failing simultaneously was feasible.

Despite that, between data within the document and other Marine Corps sources, it appears that out of all 16 known instances of hard clutch engagements in the military, two incidents -- Swift 11 and one other incident -- involved a double HCE.

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How should the Marines involve outside help?

I am reminded of the retired KY x-ray radiologist who looked over the “Otzi the 5000 year old Iceman” scans and told them they were missing an arrowhead in Otzi’s shoulder.
Later, Otzi’s keepers admitted “We cannot find Otzi’s stomach”
and the same retiree found the missing stomach position.