TR Vibe?
Which model? C or D/E?
2 blade TR or 4?
Above 1.2 it will probably depart the aircraft eventually.
If a T tail machine - check for damper weights fitted between H/Stab and Tip Plates. Yes with 2 blade TR, No with 4 blade TR.
The damper weights will mask a large imbalance. Hence balancing at GI on the T tail. If unsure remove H/Stab and check balance at FI.
Are both TR pitch links the same and correct length. D is longer than C but will fit and I have seen them intermixed - don't ask how!
235 to 245? Do you have a spectrum analysis with harmonics visible?
What changed immediately before the issue - it should be pretty obvious.
P.S. Before you burn it I will give you 5 bucks for it!
