Piper PA-23 Aztec — Service Bulletins

This Service Bulletin No. 540B from Piper Aircraft, Inc. addresses mandatory inspections and potential repairs for the stabilator tip tube and weight assembly on the PA-23-250 Aztec F aircraft. It supersedes the previous bulletin (SB 540A) and expands the serial number range for compliance. The bulletin emphasizes the importance of recurring inspections to prevent structural failures that could lead to unsafe flying conditions. It provides detailed instructions for inspection and repair, ensuring that any cracks found in the stabilator components are addressed promptly. Compliance with this bulletin is crucial for maintaining airworthiness and safety standards.

• Initial inspection must be completed within 10 hours of service or at the next scheduled maintenance.
• Recurring inspections are required every 100 hours of service after the initial inspection.
• Cracks in the stabilator tip tube and weight assembly must be repaired before the next flight.
• Specific repair instructions include welding and modifying the tube and weight assembly as outlined in the bulletin.
• Documentation of compliance must be recorded in the aircraft's logbook.