Melax, I think I know the incident you're speaking about???
a 727 departed controlled flight and entered a high speed upset, due to a TS encounter---but I don't know more--- i hope someone can enlighten us both further on the flight----in the same incident, I also believe and the had to wait until a much lower altitude to regain control due to high Mach or stab jamming??----sure seems people love to pull 'Chuck Yeagers' with the 727, however she's a tough one
jets can easily be pushed to their or past Vdf value while in a gentle climb at relatively low altitudes or---- way past Mmo to perhaps very close to Mdf at higher levels on thrust alone no dive needed!!!
Merry Christmas y Feliz Navidad, Happy Chanukah, Happy Kwanza---To all the wonderful contributers on Pprune---PA