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:

• Propeller systems are susceptible to diverse issues including mechanical failures, improper adjustments, and uncommanded operational changes during flight.
• A significant number of these problems are directly attributable to improper maintenance and faulty overhaul procedures, compromising component integrity and performance.
• Specific maintenance errors range from incorrect torquing and unapproved modifications to fundamental flaws in blade angle settings and component assembly, all of which can compromise flight safety.

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