Piper Service Bulletin No. 50
Applicability: Piper E-2, J-2, J-3, J-4 and J-5
System: Finishing
Issue Date: February 19, 1946
Subject: Ribstitching
Summary: Reported failures of the ribstitching both in the wing and control surface covering which may result in the fabric being torn from the structure while in flight.
Open PDF: PIP_SB50.pdf