https://www.faasafety.gov/files/notices/2021/Jul/AIR-21-10_(002).pdf
The attached Special Airworthiness Information Bulletin (SAIB: AIR 21-10) is to advise owners and operators of Piper Aircraft, Inc. PA-28, PA-32, PA-34, and PA-44 (see list of specific models in “Background” section) airplanes of the potential for corrosion of the forward spar to fuselage attach fittings, in an area that may not be easily accessible for inspection.
Piper Aircraft, Inc. issued Service Bulletins (SB) 789A, 977, and 1244B to inspect for corrosion on the aft wing spar to fuselage attach fittings. At the time the service bulletins were written, the corrosion was attributed to water intrusion, and forward attach fittings were not considered to be subject to the water intrusion issues affecting the aft attach fittings. Therefore, inspections of the forward attach fittings were not included in those service bulletins.
For Further Information Contact
Dan McCully, Aviation Safety Engineer, Atlanta ACO Branch, FAA, 1701 Columbia Avenue, College Park, GA 30337; phone: (404) 474-5548; fax: (404) 474-5605; email: william.mccully@faa.gov.
