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:

• Multiple propeller malfunctions and failures across various aircraft types were primarily caused by improper maintenance, incorrect installation, and unapproved overhaul procedures.
• These deficiencies led to critical operational issues such as loose components, uncommanded pitch changes, unfeathering failures, and potential in-flight component breakage, underscoring the vital importance of strict adherence to maintenance protocols and manufacturer specifications.

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