Piper PA-39 Twin Comanche C/R — Service Bulletins

Service Bulletin No. 1160A addresses the inspection and maintenance of the stabilator torque tube assembly for several Piper aircraft models, including the PA-39 Twin Comanche C/R. This bulletin supersedes the previous SB 1160 and mandates compliance for affected aircraft. It outlines the reasons for inspection, which include reports of corrosion that could lead to failure of the torque tube and potential loss of control of the aircraft. The bulletin provides detailed instructions for inspection, replacement, and repair of the torque tube assembly, emphasizing the importance of compliance to ensure safety. The document is intended for aircraft maintenance personnel and operators to ensure that necessary inspections and repairs are conducted in a timely manner.

• Inspect the stabilator torque tube assembly within the next 100 hours of operation or at the next scheduled inspection.
• Recurring inspections are required every 10 years after the initial inspection.
• If corrosion is found, repair or replace corroded parts as necessary.
• The PA-39 Twin Comanche C/R is affected, with serial numbers from 39-1 to 39-162.
• Ensure compliance with the service bulletin to prevent potential loss of control due to torque tube failure.