Propeller Hub Section
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Owners and operators of Hamilton Sundstrand Model 54H60 propellers should follow the inspection and corrective procedures outlined in Collins Aerospace SIL 866, Revision 1, dated January 24, 2023. They should verify the type of barrel markings and take corrective actions if necessary. For questions or further guidance, stakeholders should contact Collins Aerospace or the FAA representative provided.
Summary
The Special Airworthiness Information Bulletin SAIB: 2026-04 is an FAA informational bulletin addressing the Hamilton Sundstrand Corporation Model 54H60 propellers. It highlights concerns about unauthorized electric arc scribe part markings on the propeller barrel surface that may increase susceptibility to cracking. This bulletin does not mandate regulatory action but provides important safety information for operators and maintenance personnel.
What changed
SAIB: 2026-04 introduces awareness of unauthorized electric arc scribe markings on Model 54H60 propeller barrels, which may cause cracking. It references Collins Aerospace Service Information Letter 866, Revision 1, dated January 24, 2023, which provides inspection and corrective action instructions. The bulletin clarifies that no FAA airworthiness directive is currently warranted.
Why it matters
This information is critical for aviation professionals to ensure the structural integrity of Model 54H60 propeller barrels. Operators and maintenance organizations need to identify potentially harmful marking methods that could lead to cracking and subsequent safety risks. Understanding these concerns helps maintain airworthiness and avoid unexpected failures.
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