Continuing airworthiness of structural composites is a major source of head scratching... particularly as a failure is sudden, unlike with more traditional materials which usually give some indication of their state.
I suspect that Zeke may be proved correct in part ? There have been reports regarding prior damage to the stucture .. a change in structural stiffness could well have a disastrous effect on flutter onset. As to the particular sequence of events .. the investigation likely will pinpoint the problem ...
[ 18 November 2001: Message edited by: john_tullamarine ]