MT Propeller has requested the FAA issue an Airworthiness Directive (AD) with the goal of locating and updating the small number of propellers that have not yet had MT SB 30 accomplished.
This only affects a very small population of selected MT prop manufactured between late 2013 and 2014. These props may contain lag bolts in the blade roots from a run that did not meet the standards demanded by MT-Propeller.
If your MT Prop s/n is between 13XXXX and 14XXXX, you need to check the SB 30.pdf document to see if your prop s/n is included. See attached below on this page.
If you have a prop with listed s/n affected by the AD, please attend to the repair immediately as described in the bulletin. This action can be accomplished by any authorized MT service center. https://www.mt-propeller.com/en/entw/services_usa.htm
If you have an affected propeller that has already been overhauled since purchase, then you are most likely already in compliance since the new lag screws would have been installed as part of that overhaul procedure, please check to be sure.
If you have any questions, call our MT Technical Specialist, Larry Schlasinger at 866-717-1117 Ext # 3
McFarlane Aviation Products