This aircraft was undergoing extensive avionics upgrade installations. During some of the antenna installations “...a technician noticed corrosion under factory installed dampening/installation material,” writes the submitter.

This corrosion was found on the lower fuselage skins only beneath those pieces of insulating material that were apparently coming loose. He describes removing the minor corrosion and treating the affected areas. (I) suggest close inspection of this area in all aircraft. (This) problem is more than likely caused by age and moisture accumulation.” (There are two additional internal skin corrosion reports in the SDRS data base.)

Part Total Time: 5,757.0 hours.