Propeller Problems

During a routine training flight, the right engine was intentionally shut down to demonstrate inflight restarts. After a normal shutdown and securing procedure, the engine master switch was switched back to on per the checklist. Usually, this drives the propeller out of feather, and the restart procedure is continued. Instead, the propeller did not unfeather, even after attempting several troubleshooting procedures. The flight returned safely on the left engine.

Key Takeaways:

• A significant number of propeller incidents are attributed to improper maintenance and overhaul practices, including incorrect torquing, faulty adjustments, and unapproved modifications.
• These maintenance and overhaul errors often lead to critical safety issues such as loose components, structural damage, and the potential for in-flight component failure.
• Other reported problems include unexpected propeller system malfunctions like the inability to unfeather or maintain consistent RPM during flight.

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