Piper PA-18 Super Cub — Service Bulletins

This Service Bulletin No. 910A from Piper Aircraft Corporation addresses mandatory inspection and replacement procedures for the wing lift strut assembly on the PA-18/18A Series Super Cub and PA-19 Super Cub. Issued on October 10, 1989, it supersedes previous bulletins and emphasizes the importance of regular inspections to prevent corrosion that could compromise wing integrity. The bulletin is divided into two parts, detailing compliance times, affected models, and specific instructions for both inspection and replacement of wing lift struts. Compliance is deemed mandatory, and the bulletin outlines the necessary steps to ensure safety and airworthiness of the aircraft.

• Mandatory inspection of wing lift struts before next flight and every 12 months thereafter.
• Replace any struts showing signs of corrosion immediately to maintain structural integrity.
• New sealed wing lift struts must be installed within 24 months to relieve inspection requirements.
• Use specified materials and parts for compliance, including Piper Part Numbers 89497-02 and 89498-02.
• Document all inspections and replacements in the aircraft logbook.