I would imagine that’s exactly what the ASTM standards are about. The Bristell has been spin tested extensively by a Russian test pilot who works as an engineer and test pilot testing the Sukoi S35 fighter. He also happens to be a Bristell owner. For various reasons some of which have been specified and some not , CASA do not accept this testing and have asked for it to be redone by an independent organisation. As I said previously a lot of it is around documentation and extrapolation from one model to another which CASA do not think is appropriate. Perhaps I should mention the letter came from CASA’s Manager of Stakeholder Engagement for goodness sake. That had me puking before I started reading . There is a lot more to come out in this matter yet including a proper investigation of some unofficial spin testing possibly carried out at the behest of RAAUS in the Latrobe Valley a couple of years ago which is referred to in previous posts and which probably broke several CARs.