As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AUTOROTATION FLIGHT TRAINING, INSTRUCTER ROLLED THROTTLE TO IDLE. N1 WENT PAST 60 PERCENT N1 IDLE SPEED TO 52 PERCENT. FOUND PR/PG SHAFT NOT WORKING. SHAFT WOULD NOT FOLLOW CAM ON SHAFT TO ALLOW PR/PG VALVE TO OPEN OR PREVENT UNDERSHOOTING IDLE. RPM OF 60 PERCENT N1. SUSPECT RUSHING AROUND SHAFT CAME OUT OF POSITION AND ALLOWED CAM TO BEND SHAFT IN FUEL CONTROL.