What was found
(CAN) AS COLD WEATHER ARRIVED LATE SEPTEMBER THE FLAP SYSTEM DEVELOPED MORE FREQUENT FLAP FAILURE INDICATIONS. WHEN TROUBLESHOOTING THE SYSTEM IT WOULD ALWAYS OPERATE NORMALLY IN THE HANGAR. AS A LAST RESORT TO CLARIFY THE PROBLEM THE FLAP ACTUATORS WERE FROZEN WITH CO2 AND THIS CAUSED THE ACTUATORS TO FREEZE SOLID CAUSING A FLAP FAILURE. NEW ACTUATORS WERE ORDERED AND INSTALLED. SYSTEM WAS RIGGED AND OPERATIONALLY CHECKED SERVICEABLE. THIS HAS BEEN AN ON GOING PROBLEM THAT I AM TOLD IS BEING ADDRESSED BY PILATUS. S/N 373A .........2060.1TOTAL TIME179...........1865.5TOTAL TIME467A..REMOVED.1717.5TOTAL TIME398A..........1691.1TOTAL TIME