CESSNA 421C — Airworthiness Directives

This document is a schedule of airworthiness directives issued by the Civil Aviation Safety Authority of Australia, specifically addressing the Cessna 400 Series aeroplanes. It outlines the requirements for inspecting and maintaining the engine exhaust systems of various models within the series, including the Cessna 421. Notably, the directive states that the Cessna 421C model has been excluded from the applicability of this directive due to its modified exhaust system, which is not subject to the defects addressed. The document serves as a compliance guide for operators of the Cessna 400 Series, detailing inspection intervals and procedures necessary to ensure airworthiness.

• The directive applies to Cessna 400 Series models except for the Cessna 421C.
• Inspection of engine exhaust systems is required at intervals of 50, 100, and 750 hours.
• Cessna SIL ME75-17 and ME79-32 provide detailed inspection and replacement procedures.
• The Cessna 421C has a modified exhaust system and is not subject to this directive.
• The directive became effective on December 4, 1997.