Ms Jones,
Just curious, but how does
"we cannot confidently and absolutely guarantee that no cabin air contamination will occur while you are on board a 146 aircraft"
translate into an admission that aparticular aircraft is unsafe?
I could not "confidently and absolutely guarantee that no cabin air contamination will occur" on any aircraft (or any other vehicle for that matter) and I seriously doubt that any sensible person could. I do not know the circumstances involved here, but there seems to be a context that suggests hypersensitivity to particular events. If so, perhaps the consequences of knowingly placing an hypersensitive employee in that environment outweigh the consequences of terminating their services.
If my memory serves me correctly, the DC-9 had a significant history of cabin air contamination. If the B717 shares the same air conditioning/pressurisation design, would you expect QANTAS to absolutely guarantee that there would never ever be a cabin air quality event on a B717?