May a propeller spinner be removed/replaced as owner/pilot maintenance?
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May a propeller spinner be removed/replaced as owner/pilot maintenance?  It is not specifically mentioned.  However the owner/pilot is allowed to remove and replace the cowling, and is expected to inspect the spinner and bulkhead for cracks.

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No.  Item 19 of the preventive maintenance tasks list in Appendix A to Part 43 specifically prohibits removing the propeller.  OTOH, as you noted, that item does explicitly approve removing the cowling.