Piper PA-22 Tri-Pacer — Maintenance Manual

This document is Service Bulletin No. 1379A issued by Piper Aircraft, Inc., concerning the inspection and potential replacement of rudders on various aircraft models, including the Piper PA-22 Tri-Pacer. The bulletin addresses concerns regarding rudder posts made from AISI 1025 carbon steel, which may be prone to fatigue failure, posing a risk of loss of control. Compliance with this bulletin is mandatory and should coincide with the next scheduled maintenance event, not exceeding 100 hours of time in service. The document provides detailed instructions for inspecting the rudder post and replacing it if necessary, ensuring safety and compliance with FAA regulations.

• Affected serial numbers for PA-22 Tri-Pacer: 22-1 to 22-532.
• Compliance with the bulletin is mandatory and should occur within the next 100 hours of service.
• Inspection of the rudder post is required to determine if it is made from 1025 steel or 4130N steel.
• If the rudder post is 1025 steel, it must be replaced with one made from 4130N steel.
• Safety precautions must be taken when handling nitric acid during inspections.