What was found
THE DRIVE ADAPTOR SPLINE CONNECTION BETWEEN THE ROTOR TACH GENERATOR AND THE TRANSMISSION OIL PUMP SHEARED, RESULTING IN LOSS OF HYD PRESSURE AND ROTOR SPEED INDICATION.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
THE DRIVE ADAPTOR SPLINE CONNECTION BETWEEN THE ROTOR TACH GENERATOR AND THE TRANSMISSION OIL PUMP SHEARED, RESULTING IN LOSS OF HYD PRESSURE AND ROTOR SPEED INDICATION.