Piper PA-23 Aztec — Systems Description

This document serves as a maintenance reference for the Piper PA-23-250 Aztec equipped with a Lycoming IO-540 engine. It outlines specific service bulletins, inspection requirements, and part numbers relevant to the aircraft's exhaust and engine mount systems. The document is intended for maintenance personnel and pilots who need to ensure compliance with safety directives and maintain the aircraft's operational integrity. It includes detailed instructions on inspections and replacements necessary for safe operation, as well as part numbers for various components.

• Inspect engine mount for cracks every 50 hours after 1000 hours of service.
• Inspect exhaust system every 100 hours for cracks and leaks.
• Use engine mount PN 33261-001 for applicable serial numbers.
• Follow service bulletins for modifications and adjustments.
• Check Y-joint and clearance around the front crossover during inspections.