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Continental O320 crankshaft

PMA. Parts Manufacturer Approval

Parts manufacturing approval (PMA) refers to a designation given by the FAA to parts that they have considered airworthy. PMA parts are most often those that are for replacing an Original Equipment Manufacturer (OEM) part. The process of being awarded designation as a PMA part is fairly rigorous, as a PMA part is one that is considered “equal to or better than” the OEM that it is to replace. The process first entails having the FAA determine whether or not the part meets airworthiness standards. If the part passes this stage, it must then undergo inspection and then the part will have to have instructions for repair, inspection, and continued operational safety plans.
PMA parts must have sufficient documentation addressing where the part is to be used on the aircraft and will have a letter and packaging stating the same.
PMA parts are strictly tested to be the same or better than the part it is intended to replace.

Good luck
https://www.aerospacepurchasing.com/blog/what-are-tso-and-pma-parts/
 
Continental parent company purchased ECI (Engine Components Inc) back in 2015. Before that, the parts were known as ECI or Titan parts. IIRC, there was a period of time in the transition that parts were not available while new marketing / name was developed.

It is my opinion that you may want reviews on ECI / Titan crankshafts as that is how they may have been sold before the company sale and name change. Not sure how many changes were made to manufacturing processes after the name change.
 
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