Seriously? The (very) short grounding was by the contract holders to ensure safety compliance for all firefighters. Nothing to do with CASA.
John, that is what I expected and frankly, I think is a reasonable response. But what I saw reported was that it was CASA's decision, which I didn't understand. I can't see that CASA has much to do with these operations and frankly, I wonder about the ATSB too. The ATSB is certainly not going to have any of the required expertise.