A serious incident that ended well.
It's from 2009, but I didn't find any previous post.
According to the pilot report, the flight crew reported that, during final approach to runway 34 for DIY at 20 feet RA without any command, the aircraft rapidly moved to an extreme nose up position of approximately 30 degrees.
An uncommanded elevator surface deflection as a result of a left elevator PCU input arm assembly jam due to FOD lodged between the input arm assembly and the PCU housing. The FOD was a roller element from an elevator upper torque tube output crank bearing, but how or when the roller element liberated from its bearing assembly could not be determined.
The flight crew controlled the airplane through the use of full nose down stabilizer, thrust, roll and significant pilot effort by both crewmembers on their respective columns. A second approach and landing was successfully made.
A big applaud for the crew
You can read the NTSB report here:
ENG09IA011