CESSNA 421 TURBINE — Service Bulletins

This document is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority of Australia, specifically addressing turbocharger issues related to various aircraft, including the Cessna 421 Golden Eagle. The directive outlines necessary inspections and compliance requirements to ensure the safety and airworthiness of affected aircraft. It focuses on the inspection of turbochargers installed on specific engine models, detailing the part numbers and serial numbers that are subject to the directive. The document is crucial for maintenance personnel and pilots to understand the compliance requirements and ensure the safety of flight operations.

• The maximum allowable gap for turbocharger inspection is 0.005 inches.
• Compliance with the inspection must occur within 10 hours of time-in-service or at the next regular inspection.
• Turbochargers exceeding the gap must be replaced before further flight.
• The directive addresses safety concerns related to exhaust leakage and potential fire hazards.
• Affected turbocharger models include those installed on Cessna 421 Golden Eagle aircraft.