Piper PA-36 Pawnee Brave — Service Bulletins

This document is a service bulletin from Hartzell Propeller Inc. detailing inspection and maintenance requirements for specific propeller hubs. It primarily addresses the Hartzell two-blade, aluminum hub, 'compact' series propellers manufactured before April 1997, particularly those installed on various aircraft, including the Piper PA-32 series. The bulletin outlines the necessary inspections, compliance requirements, and potential actions for propellers that may exhibit signs of wear or failure. It emphasizes the importance of adhering to the latest revision to ensure safety and compliance with FAA regulations. The document includes detailed instructions for inspections, hub replacements, and modifications to ensure continued airworthiness of the propeller systems.

• Propellers manufactured before April 1997 without 'A' or 'B' suffixes require mandatory inspections.
• Initial eddy current inspections must be performed within 50 hours of operation, with subsequent inspections every 100 hours.
• Installation of a hub with a 'B' suffix or modification to an oil-filled configuration increases weight by 0.50 lb (0.23 kg).
• Hubs with an 'A' suffix must be replaced at the next overhaul, not to exceed 1000 hours or 72 months from the effective date of the directive.
• Only qualified personnel should perform hub inspections and replacements.