since 1940

Failure to feather. Sluggish feather

 2. High-pitch pin stop fails to slide out at feathering rpm.

 3. Weak or broken feathering spring.

 4. Incorrect governor lift rod (feathering) setting.

5. Crankshaft oil control plug (Hubbard plug) in the forward end of crankshaft not properly installed.

6.Air charge lost or low

7. Check governor drain function.

8. Internal corrosion (usually in blade bearings or pitch changing mechanism) that result in excessive friction. Propeller must be checked at a propeller repair facility.
 

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided  is not intended to supercede or supplement the F.A.A. approved  maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.