CESSNA 414 — Maintenance Manual

This service bulletin provides critical information regarding the replacement of the turbocharger back plate assembly for specific turbocharger models used in various aircraft, including the Cessna 414. It outlines the compliance requirements for replacing the obsolete back plate assembly P/N 406795-0058 with the new P/N 490006 or 490045-0000 during the next turbocharger overhaul. The document emphasizes the importance of adhering to the latest revisions and provides detailed instructions for inspection and corrective actions to ensure continued airworthiness. This bulletin is intended for maintenance personnel and technicians involved in the servicing of affected turbocharger systems.

• Replace P/N 406795-0058 back plate assembly with P/N 490006 or 490045-0000 at next overhaul.
• Compliance is required after 2000 hours of turbocharger time or twelve calendar years.
• Inspection of the back plate assembly can be done visually without disassembly.
• Qualified personnel must perform the replacement to avoid safety risks.
• Document compliance with the service bulletin in maintenance records.