What was found
DUE TO AGING AIRCRAFT CONCERNS THIS OPERATOR HAS EMBARKED ON A FLEET CAMPAIGN TO REMOVE THE ELEVATOR PUSH PULL TUBES FROM THE C441 AIRCRAFT AND SEND THEM OUT FOR AN XRAY INSPECTION. WE HAVE PERFORMED INSPECTIONS ON FOUR TUBES P/N 5815144-204 (ORIGINAL P/N 5815144-17) ONE OF THE FOUR HAVE EXHIBITED CORROSION ON THE INTERNAL SURFACES OF THE TUBE. THESE TUBES ARE CONSTRUCTED WITH ALUMINUM END FITTINGS SECURED INTO A STEEL TUBE; THERE ARE CURRENTLY NO RECOMMENDED INSPECTIONS OF THESE TUBES OTHER THAN EXTERNAL VISUAL. WITH THE C441 FLEET AGE APPROACHING 40 YEARS IT WOULD BE PRUDENT TO RECOMMEND X-RAY INSPECTION OF THE TUBES FOR INTERNAL CORROSION.