CESSNA C-165 — Service Bulletins

This Service Bulletin, HC-SB-61-165E, issued by Hartzell Propeller Inc., provides critical inspection and compliance information for specific propeller models, particularly those installed on Piper PA-31 Navajo Chieftain aircraft. The bulletin outlines the effectivity of the propeller hub inspection requirements, detailing which propeller assemblies are affected and the necessary compliance actions. It includes revisions to previous bulletins, emphasizing the importance of adhering to the latest inspection protocols to ensure flight safety. The document is intended for aircraft maintenance personnel and operators of affected aircraft models, providing detailed instructions for visual and eddy current inspections, as well as modification options for lubrication fitting holes.

• Affected models include Piper PA-31 Navajo and PA-31-350 Navajo Chieftain with TIO-540 engines.
• Compliance inspections must be performed within specified flight hours, typically 10 or 50 hours depending on the model.
• Visual and eddy current inspections are mandatory for compliance with the Service Bulletin.
• Modification of lubrication fitting holes is an option to reduce inspection frequency.
• Failure to comply with inspection requirements may lead to severe safety risks, including blade separation.