I own a DA20 and the prop is getting to the point where it will need an overhaul so I recently tried to figure out when the overhaul was needed. I had some trouble finding the information, but I received this reply from Sensenich and thought I would post it here for those who might be interested.
The propeller in question is a Sensenich propeller model W69EK7.
The reply from Sensenich:
Sensenich wooden propellers have no set Time Before Overhaul (TBO).
The continued airworthiness is detailed on the last page of the Sensenich document: Wood Propellers: installation, operation, and maintenance instructions for integral flange crankshafts.
The link to the web document is:http://www.sensenich.com/files/document ... 581692.pdf
Basically, wooden propellers are serviced on-condition, as determined through preflight, 100 hour, and annual inspections. The operating tips and types of damage requiring repair or retirement are listed in our propeller installation instructions.
The cost for a refinish/rebalance is about $300.00. An overhaul with new leading edges is about $550.00.
Please contact us with any questions.