What was found
(CAN) IN CRUISE, PILOT ATTEMPTED TO CENTER THE BALL IN THE TURN AND BANK INDICATOR BY APPLYING RUDDER TRIM. WHEN APPLIED, AFFECT WAS OPPOSITE TO NORMAL, TURNED TRIM WHEEL LT AND RT RUDDER TRIM WAS NOTED. PILOT LANDED AND ADVISED MAINTENANCE. MAINTENANCE DISCOVERED RUDDER TRIM WAS OPERATING OPPOSITE TO NORMAL. COMPLETE INSPECTION OF THE RUDDER TRIM SYS REVEALED CABLES EXITING THE REAR BULKHEAD TO PULLEYS THAT DIRECT TRIM CABLES UP VERTICAL STABILIZER WERE ROUTED INCORRECTLY. TRIM SYS WAS ASSEMBLED CORRECTLY, DUAL INSPECTION PERFORMED, AND ACFT RETURNED TO SERVICE. QA WAS NOTIFIED AND INVESTIGATION REVEALED: ACFT WAS IMPORTED FROM THE US 6 YEARS AGO AND PAINTED. SYS WAS NOT ALTERED DURING THE IMPORT PROCESS NOR SINCE. IN THE FOLLOWING YEARS TO PRESENT, FLIGHT CREWS AND MAINTENANCE CREWS HAD MISSED THIS POTENTIALLY DANGEROUS ERROR, CRITICAL DURING ENGINE FAILURE TO ASSIST FLYING WITH ASYMMETRIC THRUST. IF THE PILOT HAD AN ENGINE FAILURE AND WENT TO USE THIS SYS, IT WOULD HAVE MADE HIS SITUATION MUCH WORSE. ACFT IS USED IN A FIRE SUPRESSION ROLE.