Piper Service Bulletin No. 573
Applicability: Piper PA-11, PA-12, PA-14, PA-16, PA-18 serial numbers 18-1 thru 18-7609068, PA-20, PA-22
Issue Date: February 8, 1978
Subject: Wing Fuel Tank Cap Modification
Summary: A recent fuel tank collapse was attributed to inadequate venting, caused by obstruction of the cap vent holes installed per Piper Service Bulletin No. 522.
Open PDF: PIP_SB573.pdf