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 portion of reported propeller incidents stemmed from improper maintenance and overhaul procedures, including incorrect torquing, unapproved modifications, and faulty adjustments.
• Other issues involved propeller system malfunctions such as uncommanded pitch changes, unfeathering failures, and inconsistent RPM, necessitating repairs or replacements.

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