What was found
AILERON TRIM INDICATION, AILERON TRIM TAB POSITION INDICATION. INTERMITTENT ERRATIC FLICKERING OF THE AILERON TRIM INDICATION. SYMPTOM APPEARS RANDOMLY, UNRELATED TO TRIM POSITION OR FLIGHT PHASE, AND HAS PERSISTED ACROSS MULTIPLE COMPONENT REPLACEMENTS. AILERON TRIM ACTUATOR AND POSITION TRANSMITTER REPLACED SEVERAL TIMES. WING HARNESS REPLACED. FUSELAGE HARNESS REPLACED UNDER THE GARMIN G1000 STC. ORIGINAL APEX AVIONICS REPLACED WITH THE GARMIN G1000 INSTALLATION. FAULT PERSISTS ON THE G1000 DISPLAY. ANALYSIS: WITH THE TRANSMITTER, ACTUATOR, WING HARNESS, FUSELAGE HARNESS, AND BOTH AVIONICS SUITES REPLACED, THE FAULT HAS NOT BEEN ISOLATED. THE LINEAR POTENTIOMETER DESIGN IN THE TRIM TRANSMITTER IS A KNOWN WEAK POINT, WIPER CONTACT ON A RESISTIVE TRACK IS INHERENTLY PRONE TO INTERMITTENT CONTACT, AND MOISTURE IN THE AILERON ENVIRONMENT CAN AGGRAVATE IT. THE G1000 ANALOG INPUT MAY ALSO BE MORE SENSITIVE TO SIGNAL NOISE THAN THE ORIGINAL INDICATOR. RECOMMENDATION: VIKING AIR INVESTIGATE WHETHER THIS IS A KNOWN FLEET-WIDE ISSUE AND CONSIDER A DESIGN REVIEW OF THE TRIM POSITION TRANSMITTER OR AN ALTERNATIVE SENSING METHOD.