EASA SIB SAIB-2023-04: Propeller Assembly by Trinity Specialized Services, LLC

What to do

Owners, operators, and maintainers of Hartzell and McCauley constant speed propellers returned to service by Trinity Specialized Services, LLC during the specified period should have their propellers inspected or overhauled by an FAA-certified repair station. Any discrepancies found should be reported to the FAA and through the service difficulty reporting system. There is no mandatory compliance deadline, but timely action is recommended to ensure airworthiness.

Summary

The Special Airworthiness Information Bulletin SAIB: 2023-04 is an FAA information bulletin addressing airworthiness concerns related to Hartzell and McCauley propellers that were returned to service by Trinity Specialized Services, LLC between January 29, 2016 and March 25, 2021. The bulletin highlights improper maintenance and overhaul practices affecting these propellers but does not mandate regulatory action. It is intended to inform owners, operators, maintenance technicians, and inspectors about potential reliability issues with these propellers.

What changed

SAIB: 2023-04 introduces awareness of maintenance discrepancies involving Hartzell and McCauley constant speed propellers serviced by Trinity Specialized Services, LLC. It identifies specific improper practices such as use of unapproved parts and unqualified personnel performing critical inspections and treatments. The bulletin does not impose mandatory directives but recommends voluntary inspections or overhauls by authorized FAA-certified repair stations.

Why it matters

This bulletin matters because it alerts aviation professionals to potential airworthiness concerns that could affect the reliable operation of affected propellers and related systems. Operators and maintenance organizations need to be aware of these issues to ensure continued safety and compliance. Early detection and corrective action can prevent possible future failures and maintain fleet safety.