an MoU be established between ATSB and CASA
Why do these two organisations need a MoU?
ATSB should be at arms length from CAsA.
The ATSB could/should investigate the methodology, the application of the Regs and "policy" of CAsA during an accident investigation.
If there was a MoU between these two organisations, this could, in theory, place limitations on what the ATSB could do in investigating CAsA.
If the ATSB want information from CAsA, it should be obtained in the same way the ATSB obtains information from the industry.
For better or worse, CAsA is part of the industry. In accident investigations, should be subject to the same obligations and investigations as any industry participant.