As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TRAINING FLIGHT STUDENT PILOT REPORTED HIS SEAT WOULD NOT LOCK IN POSITION. ACFT RETURNED TO BASE WITHOUT INCIDENT. UPON TROUBLESHOOTING OF PROBLEM MX FOUND THE ATTACHMENT SCREWS OF THE LT AND RT SEAT STOP PINS HAD BACKED OUT ALLOWING THEM TO BE DETACHED AND BECOME INEFFECTIVE. CHECK OF OTHER ACFT IN FLEET FOUD 6 OTHER ACFT THAT HAD LOOSE ATTACHMENT SCREWS. ALL LOOSE SCREWS WERE REMOVED, INSPECTED AND REINSTALLED WITH LOC-TITE 242 IAW MFG.