CESSNA 421C — Service Bulletins

This document is an Airworthiness Directive (AD) schedule specifically for the Cessna 421 series aircraft, including the 421B and 421C models. Issued on May 31, 2018, it outlines mandatory inspections, modifications, and compliance requirements to ensure the airworthiness of these aircraft. The directives are issued by the Civil Aviation Authority of New Zealand and are applicable to various components and systems of the aircraft, including landing gear, fuel systems, and emergency procedures. The document serves as a critical reference for maintenance personnel and operators to maintain safety and compliance with aviation regulations.

• The document is an Airworthiness Directive schedule for Cessna 421B and 421C aircraft.
• Mandatory modifications and inspections are outlined to ensure safety and compliance.
• Specific compliance dates are provided for various modifications and inspections.
• The document includes critical information regarding severe icing conditions and necessary AFM revisions.
• Operators must ensure that flight crews are aware of the revisions to the flight manual.