A repair shop forwarded us a competitor’s set of FAA PMA starter generator bearings for further inspection and lab analysis. These bearings (for Goodrich/APC starter generators) were offered at a very affordable price. But we were curious, and asked ourselves: “How can these bearings that are the same size and somewhat similar in appearance be priced lower than the rest? More importantly, are they of the same design and material quality as those offered by Miraj and other industry leaders?” So we investigated, and below is a summary of our findings.