ORIGINAL: ianober
If the stab was not dynamically balanced close to the MAC you would have seen this problem before now. Sounds like a linkage let go. Dantley flew his Mig-29 for several flights with a P-200 and never had any issues with flutter so I dont think they have the pivot point wrong. Static balancing wont help flutter, most full scale jets do not have statically balanced stabs, why should ours?
But Ian, Dantley's Mig-29 was from SM and the one Shaun was flying was from JL. Not to start a brand war, but Ian, (as you are well aware) the JL F-20 had some Stab balancing issues apparently that led to some problems and crashes. Frankly, it sounds more like a linkage failure than a balance issue in this particular case, but of course Murphy's Law says it would have to happen to a JL product so the 800lb elephant in the room becomes: "If they had poorly balanced stabs leading to disaster on their F-20, is it possible that the same issue occurred on their Mig-29?".
I'm not sayin', I'm just sayin'
Consider the pot stirred!
Shaz