You probably missed the saga prior to your 5 years with it?
Much happened after that. I was following it all but I'm sure I don't know the whole story.
Some years ago, one of my friends sought a dual flight in a Bristell at a flight school. He was told they didn’t do stalls in them! A year or so later a CASA examiner told me that pilots were presenting themselves for flight tests in Bristells and refusing to stall them for the test. Why was that? I spoke to some Bristell flight instructors.
In 2020, CASA issued a safety notice for flight schools operating Bristells which “prohibited from conducting an intentional stall of the aircraft, or from performing any flight training activities that could reasonably lead to an unintended stall …”
CASA then “sought confirmation from the manufacturer as to compliance with the ASTM LSA standards and, in particular, spin compliance flight testing. At the present time, CASA has not received sufficient assurance as to the extent of such testing, including testing covering each design variant.” It seemed to me that BRM had shown compliance with the spin requirements (I reviewed the reports) but CASA was stuck on the thought that it must not comply because of the spin accidents but unable to identify any specific issues with the test reports.
Then we got some independent flight tests of an in-service aeroplane with questions as to the conformity of the particular aeroplane and conduct of the tests. All a little murky as to who authorised these tests. Certainly not CASA.
I did a W&B calculation from the data in the manual. Two people at 90 kg each right on the aft limit. Then there was another airworthiness alert! The crew moment arm in the manual was incorrect. W&B section of the manual was rewritten to make comparisons difficult. The same two 90 kg people now put the CG way way behind the aft limit!
Aeroplanes were reweighed and ballast added firewall forward to move the empty CG forward. Moving the CG forward has a beneficial effect on handling characteristics, especially stalling and spinning.
All the issues seemed to disappear overnight. No more said that I am aware of. The whole saga certainly showed the incompetence of some at the factory, RAA and CASA. Some at the regulatory authority especially were out of their depth.