What was found
IN FLIGHT, HYD CAUTION LIGHT ILLUMINATED FOLLOWED WITH IN 10-15 SECONDS A COMPLETE LOSS OF HYD PRESSURE. PILOT PERFORMED EMERGENCY PROCEDURE UNABLE TO RESTORE HYD PRESSURE. LANDED AS SOON AS PRATICAL. MX REMOVED THE HYD PUMP BUT FOUND THE TRANSMISSION OIL PUMP SPLINES HAD FAILED. DUE TO THE FACT THE TRANSMISSION OIL PUMP HAD FAILED, IS A DIRECT RESULT OF WHY THE HYD PUMP WAS UNABLE TO PRODUCE PRESSURE SINCE THE HYD PUMP IS DRIVEN BY THE TRANSMISSION OIL PUMP.