EASA SIB NE-13-32
Hartzell Propeller Spinner Assemblies P/N 835-54(P) and P/N 835-58(P) — Potential for Cracking of the Spinner Dome
Summary
The FAA Special Airworthiness Information Bulletin SAIB: NE-13-32 informs owners, operators, and repair facilities of Piper PA-24, Piper PA-28R-180, Piper PA-28R-200, and Mooney M20 airplanes (except Mooney M20(J)) equipped with Hartzell Propeller spinner assemblies P/N 835-54(P) and P/N 835-58(P) about the potential for cracking in the spinner dome. This cracking could lead to spinner failure and separation during flight. The bulletin provides safety information but does not mandate regulatory action under 14 CFR part 39.
What Changed
This bulletin introduces awareness of a cracking issue in specific Hartzell spinner assemblies installed on certain Piper and Mooney aircraft models. It highlights that the cracking can cause in-flight vibrations and premature landings, and notes that Hartzell has developed a replacement spinner design to mitigate the problem. The bulletin does not impose mandatory directives but recommends inspection and replacement guidance.
Why It Matters
This information is critical for aviation professionals because cracked spinner domes can lead to spinner separation, causing potential damage to the aircraft and safety hazards during flight. Operators and maintenance personnel need to monitor spinner condition closely to prevent in-flight failures and unplanned landings. Awareness of the issue helps ensure timely maintenance and reduces risk to aircraft integrity and passenger safety.
What To Do
Operators should inspect the spinner dome during pre-flight checks and replace the spinner immediately if any cracks are found. If no cracks are detected, the spinner assembly should be replaced within 50 flight hours. Maintenance should follow Hartzell Service Bulletin HC-SB-61-311 Revision 5 and Hartzell Alert Service Bulletin HC-ASB-61-332 Revision 5 or later FAA-approved revisions for guidance.