What was found
CLIMB, 50-60 KTS IAS ABOUT 1K FPM RATE , PILOT NOTED VIBRATION IN T/R. RETURNED ORIG TAKEOFF POINT, LANDED. VIBRATION BECAME STRONGER DURING DESCENT. FOUND 8 BOLTS RETAINING T/R BLADE, 1 EA BOLT HEAD MISSING AND NEVER FOUND. 3 EA BOLT HEADS BROKEN ABOUT 3RD THREAD OTBD FROM SHANK, AND 2 BOLTS HAD NO TORQUE REMAINING. RED T/R BLADE REPLACED AND ACFT INSPECTED FOR PROBLEMS, NONE FOUND. THIS IS UPDATED MDR.