NTSB Probable Cause

THE PILOT'S IMPROPER PREFLIGHT PERFORMANCE PLANNING AND DECISION TO OPERATE THE AIRPLANE OVER THE MAXIMUM CERTIFIED GROSS WEIGHT AT A HIGH DENSITY ALTITUDE AIRPORT WHICH RESULTED IN AN INADVERTENT STALL. CONTRIBUTING TO THE ACCIDENT WAS INADEQUATE MAINTENANCE INSPECTIONS DURING THE THREE PRECEDING ANNUAL INSPECTIONS WHICH FAILED TO DETECT BROKEN GEAR TEETH FROM A PREVIOUS MAINTENANCE DEFICIENCY WHICH ACCELERATED THE ENGINE WEAR THROUGH FOREIGN OBJECT DAMAGE.