CESSNA 421 TURBINE — Service Bulletins

This Mandatory Service Bulletin (MSB10-3) issued by Teledyne Continental Motors addresses the critical need for turbine wheel replacement in certain rebuilt turbochargers. The bulletin is aimed at owners and operators of turbocharged aircraft, specifically those utilizing rebuilt turbochargers supplied by Kelly Aerospace Energy Systems between January 2007 and June 2009. Compliance with this bulletin is mandatory and must be performed at the next scheduled maintenance event, not to exceed ten hours of operation. The document outlines the procedures for identifying affected turbochargers, the compliance requirements, and the necessary steps for replacement to ensure continued airworthiness and safety.

• Compliance is mandatory at the next scheduled maintenance event, not exceeding 10 hours of operation.
• Affected turbochargers were supplied between January 2007 and June 2009.
• The Cessna 421 series is specifically mentioned as affected by this bulletin.
• Operators must identify affected turbochargers using part and serial numbers listed in the bulletin.
• Operational tests must be conducted after turbocharger replacement before returning the aircraft to service.