If the oxygen bottle assembly was only fitted to the aircraft 6 months ago, then who overhauled it and did QANTAS trained engineers fit it or were they contractors working for QANTAS. I ask this as a lot of QF people are under pressure at the moment.
It is irrelevant whether contractors or Qantas did it - the only thing that matters is whether they did it to appropriate Qantas standards (or not).
I hardly think anyone wants this thread to turn into irrelevant union-instigated contractor-bashing, so why not start up another thread if you want to go there?