CESSNA 421C — Systems Description

This document is a service bulletin for the Cessna 421C Eagle II and Eagle III, detailing critical inspection and maintenance procedures for the exhaust system. It outlines the necessary intervals for visual inspections, removals, and replacements of various exhaust components to ensure safety and performance. The bulletin is intended for maintenance personnel and pilots who are responsible for the upkeep of the aircraft's exhaust system. It emphasizes the importance of regular inspections and provides specific guidelines on what to look for during these checks, particularly concerning the integrity of the exhaust components made from Inconel.

• Visual inspection of the exhaust system every 50 hours or 30 days.
• Tailpipes must be inspected for cracks and corrosion every 12 months.
• Replace multi-segment V-band clamps every 500 hours of operation.
• Remove exhaust system every 2500 hours or 12 years for inspection.
• Inconel components require careful inspection due to internal corrosion.