There but for the grace of god..............
We carry AVV as an Altn for MEL most of the time and I was under the false impression that when the tower was closed it was OCTA.
I wasn't aware that it is Class E 700' up and IFR require a clearance in Class E.
Also as said above, we overseas operators that haven't flown Domestic IFR in Oz for 20 years may have forgotten all the night Vis App requirements in the Oz AIP. I know I recalled some of the requirements but not all.
Thank goodness it's happened to Tiger because it's given me a wake up call if I ever divert to AVV when the towers closed.
Poor buggers, I hope they aren't hung out to dry?