What was found
THE HYDRAULIC POWER PACK FAILED WHEN PILOT ATTEMPTED TO EXTEND LANDING GEAR. THE HYDRAULIC POWER PACK LOST ALL PRESSURE AND DUMPED HYDRAULIC FLUID OUT THE BACK. THE AIRCRAFT LANDED GEAR UP. SENT HYDRAULIC POWER PACK TO THE COMPANY THAT OVERHAULED UNIT IN 1994. THIS COMPANY'S EVALUATION OF THE POWER PACK'S FAILURE WAS DUE TO A MISSING LEE PLUG AND STATED THE LEE PLUG HOLE IS OVERSIZED AND WILL NOT HOLD WHEN PRESSURE IS APPLIED.