Piper J-4 Cub Coupe — Service Bulletins

This document contains airworthiness directives (LUFTDYKTIGHETSPABUD) specifically addressing safety modifications and inspections required for various Piper aircraft models, prominently featuring the Piper J-4 Cub Coupe. It outlines critical safety issues, including structural inspections, part replacements, and modifications necessary to maintain airworthiness. The directives are aimed at aircraft owners, operators, and maintenance personnel, emphasizing the importance of compliance to ensure safety and reliability in flight operations. The document includes specific part numbers, inspection intervals, and procedures to follow, ensuring that all necessary actions are taken within the stipulated timeframes to prevent accidents and maintain airworthiness.

• Replace lift strut bolts (P/N 11281 to 13710) by April 1, 1953.
• Inspect strut attachments for cracks at each 25-hour inspection and every 100 hours thereafter.
• Check balance rudder horns for loose rivets every 100 flight hours.
• Conduct X-ray inspections of landing gear axles every 1200 flight hours; replace if cracks are found.
• Ensure seat belts do not obstruct rudder pedal operation before each flight.