This Special Airworthiness Information Bulletin alerts you, owners, operators, and certificated repair facilities of aircraft equipped with Hartzell Propeller, Inc. various propeller models that have certain serial numbers and part numbers (P/N) of the potential for corrosion of the guide rods. This corrosion could lead to inability to adjust the pitch of your propeller. A detailed list of effectivity can be found in Hartzell Propeller Alert Service Bulletin (ASB) HC-ASB-61-351. At this time the airworthiness concern is not an unsafe condition that would warrant airworthiness directive action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.
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