EASA SIB SAIB-2025-10: Propeller Controlling System

What to do

Owners and operators of Hamilton Sundstrand Model 247F-3 propellers on Xi’an Model MA60 airplanes are recommended to incorporate the modifications detailed in Hamilton Sundstrand Service Bulletin 247F-61-66 dated October 31, 2018. There is no FAA-mandated compliance deadline, but timely action is advised to address the potential safety concern. For further assistance, stakeholders should contact the FAA or Hamilton Sundstrand support.

Summary

The FAA Special Airworthiness Information Bulletin SAIB: 2025-10 addresses potential pitch change yoke fractures in Hamilton Sundstrand Corporation Model 247F-3 propellers installed on Xi'an Aircraft Industrial Corporation Model MA60 airplanes. This bulletin highlights an airworthiness concern specific to the Xi’an Model MA60, which is not FAA type certificated, and does not apply to other airplanes with 247F series propellers. The document provides information and recommendations but does not mandate regulatory action.

What changed

SAIB: 2025-10 introduces awareness of pitch change yoke fractures linked to elevated oil temperatures in the Hamilton Sundstrand 247F-3 propeller system on Xi’an Model MA60 airplanes. It references Hamilton Sundstrand Service Bulletin 247F-61-66 from 2018, which addresses this issue through recommended modifications. No new regulatory mandates or airworthiness directives are issued by the FAA in this bulletin.

Why it matters

This bulletin is important for aviation professionals because it identifies a specific mechanical risk that could affect propeller integrity and airplane safety on the Xi’an Model MA60. Operators and maintenance organizations need to be aware of the elevated oil temperature conditions that can cause cracking in the pitch change yoke, which could lead to propeller vibrations or failures. Understanding this issue helps ensure proper maintenance and risk mitigation for affected aircraft.