What was found
DURING CRUISE FLIGHT, APPROX 30 MINS INTO THE RETURN LEG, EXPERIENCED A SINGLE & SEVERE JERK & BUMP THROUGH THE ACFT. THE PILOT CONSIDERED THE BUMP SEVERE ENOUGH TO WARRANT CHANGING COURSE TOWARDS THE NEAREST SUITABLE LANDING AREA. AFTER 3 MINS OF FLIGHT THE PILOT FELT THE SAME JERK & BUMP AGAIN. PERFORMED A PRECAUTIONARY LANDING, APPROX 2 MINS LATER, THE PILOT FELT THE SAME SINGLE SEVERE BUMP ONCE MORE. THE PILOT SHUT THE ACFT DOWN WITH NO FURTHER INCIDENT. MECHANIC ON SITE DETERMINED THAT VERTICAL GYRO HAD A BURNT ELEC SMELL COMING FROM THE CASE, INTERNALLY. REPLACED VERTICAL GYRO AS REQUIRED & PERFORMED A SUCCESSFUL OPERATIONAL CHECK FLIGHT. NO FURTHER DEFECTS NOTED.