Beechcraft 60 Duke — Service Bulletins

This Service Bulletin 040 issued by Hartzell Engine Technologies addresses a critical condition affecting turbocharger center housing rotating assemblies (CHRA) in certain turbocharged aircraft, specifically the Beechcraft 60 Duke. The bulletin mandates the cleaning of the CHRA center housing to prevent potential engine power loss due to debris that may enter the oil flow. It outlines compliance procedures based on the hours of service of the turbocharger and provides detailed instructions for identification, disassembly, cleaning, and reassembly of the turbocharger. The document is intended for maintenance personnel and emphasizes the importance of following the specified procedures to ensure safety and reliability.

• Turbochargers with 0-10 hours TIS require immediate inspection and cleaning.
• For 10-50 hours TIS, inspection must occur within the next 10 hours.
• No action is required for turbochargers over 50 hours TIS.
• Identification of affected turbochargers is critical to prevent engine failure.
• Cleaning procedures must be followed precisely to ensure safety.