As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPTIONAL VERTICALLY ADJUSTING PILOTS SEAT MOVED AFT DURING TAKEOFF, FOUND LT REAR BELLCRANK ASSY CRACKED WHICH DISTORTED SEAT ALLOWING SEAT PINS NOT TO FULLY ENGAGE SEAT TRACKS. INSTALLED A NEW BELLCRANK AND TUBE. NEW BELLCRANK HAD REINFORCEMENT STRAPS WELDED AT FAILURE POINT. SEAT OPERATED NORMALLY AFTER REPLACEMENT. (K)