What was found
WHILE EN ROUTE TO MCI THE FLIGHT CREW ELECTED TO SHUT DOWN THE RIGHT ENGINE AS A PRECAUTIONARY MEASURE DUE TO ERRATIC PROPELLER SPEED INDICATION AND DIVERTED TO COU. EXDA MAINTENANCE WAS DISPATCHED TO COU AND INSPECTED THE PROPELLER RIGGING IAW SHORTS MAINTENANCE MANUAL, NO DEFECTS FOUND. THE AIRCRAFT WAS OPERATIONALLY CHECKED AND THE MAXIUM STATIC TAKEOFF POWER RUNS WERE SATISFACTORILY PERFORMED IAW THE SHORTS MAINTENANCE MANUAL. THE DISCREPANCY COULD NOT BE DUPLICATED ALL SYSTEMS OPERATIONALLY CHECKED NORMAL. N973AA WAS RETURNED TO SERVICE ON 8/11/2007.