the PAPI
One issue to be aware of.
The disability discrimination act requires parties (including CASA and all airport owners) to modify their equipment as much as reasonably possible to accommodate workers with disabilities. This would clearly encompass removal of PAPIs and replacement with T-VASIS systems. The official reason why most airports removed the PAPI and replaced it with the T-VASIS was to save money.
If the PAPI is the only system in aviation that CVD pilots demonstrably can't use, then under legislation it is the PAPI, not the disabled workers, that must go.
CASA must show that the requirement for good colour vision is an unavoidable, inherent concomitant of aviation, not just the need to interpret one solitary instrument that could easily be replaced. They can't legally discriminate solely on the basis that a simulated test shows that the pilot can't use the PAPI.
Even if such a simulated test existed, which it currently does not.
And even if CASA could show that CVD pilots can't use the PAPI, which CASA cannot.