It’s not a change in the standard.
It’s a change in CASA’s position on the safety efficacy of the standard.
The fundamental points that have to be made, over and over again, are that:
- The CV standard itself is based on ignorance and prejudice – it’s just a hangover from 19th century maritime navigation rules and infrastructure that have no practical application to 21st century aviation operations.
- The only evidence with probative value supports the conclusion that there is no difference in the competence or safety of pilots with colour vision defects compared with pilots without colour vision defects. There is no evidence with probative value to support any other conclusion.
- CASA should regulate on the basis of evidence rather than ignorance and prejudice.