Who is responsible for making a safety case.
It seems CASA has decided to set some additional rules about attendance of staff in the cockpit. Fair enough, there are pros and cons, but presumably CASA in their wisdom assessed these before bringing down the rules.
But it appears that CASA has dictated these changes, and is now asking the airlines to make a safety case for the changes that they, CASA have mandated.
Another ducking of responsibility by CASA? Where is their safety case for making the changes?
Surely the logical answer is "CASA has mandated the change, the airlines are simply implementing what is required by law". However we know that logic plays little role in these matters.