What was found
(CAN) ON APPROACH, THE RT ENGINE TACHOMETER BECAME ERRATIC THEN DROPPED TO ZERO RPM. MAINTENANCE FOUND THE TACH GENERATOR DRIVE SHAFT ROLL PIN SHEARED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) ON APPROACH, THE RT ENGINE TACHOMETER BECAME ERRATIC THEN DROPPED TO ZERO RPM. MAINTENANCE FOUND THE TACH GENERATOR DRIVE SHAFT ROLL PIN SHEARED.