As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TRAINING, IT WAS NOTICED THAT THE TACH NEEDLES DID NOT SEPARATE WHEN THE THROTTLE WAS ROLLED BACK TO IDLE. FREEWHEEL ASSY WAS REMOVED AND SENT TO O/H SHOP FOR INSPECTION. DURING INSPECTION CLUTCH ASSY WAS DEEMED UNSATISFACTORY.