Australian Aviation Regulator: No risk assessment docs exist re masks

The FOI game is all about asking for the right thing in the right way, but according to the way this question was asked (“all documents, emails, data and supporting evidence for any CASA risk assessment…”), literally no such documents exist.

That, if true, means the Australian aviation regulator performed zero risk assessment for the use of masks by aviation personnel while at altitude under any circumstances.

This would imply that, like is seen in aspects of UK government documents, the responsibility may be outsourced to corporations e.g. airlines.

However, using the UK as a parallel example, there exists written admission from a major UK airline that it never did any such risk assessments despite making its employees and passengers use masks when at work and when airborne.