EASA SIB AIR-21-07
Piper PA-28 and PA-32 aeroplanes - Verification of Correct Washers used with Wing Spar Attach Bolts
The FAA Special Airworthiness Information Bulletin AIR-21-07 addresses the verification of correct washers used with wing spar attach bolts on Piper PA-28 and PA-32 aeroplanes. This bulletin provides guidance related to compliance with Airworthiness Directive 2020-26-16, focusing on the proper washer style to ensure structural clearance. It highlights issues with incorrectly manufactured washers that lack the required rounded edges.