Fed sec,
I wish you luck in this case. I really do.
It's unfair that people should lose their jobs because a company chooses to protect others in a non compliant LOFO process.
However, Fair Work Australia has demonstrated already that they are ready to rule against good sense as they have done in the matter of PR525218 re pre flight safety checks.
If they see that the "greater good" is served by ruling in favour of the company..they will.
They let the ALAEA (and indeed the travelling public) down very badly considering the evidence and failed to take in account the safety concerns involving passengers.
So I think it's hard to see them ruling fairly in this matter.
Good luck anyway.
P.S. The flight safety check orders have expired. Will you take this matter to the Senate Inquiry for CASA to answer ??