Propeller Problems

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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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.
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