Someone with a transmitter allegedly issuing go-arounds on short final to aircraft on approach.
Haven't had chance to research more yet.
Quick link to an article below, but your usual quality journalism filter needs to apply.http://www.news.com.au/travel/travel-updates/incidents/afp-investigating-15-unauthorised-radio-transmissions/news-story/f2792505af8e83bce39b1dd904c5e55b
Will start slowly wading through the feeds, 2nd article has a date and time, so can start there. but no details yet on the other 14.
Incident with VA740 has the briefest mention of the incident on Melbourne Center freq at 24min 50sec mark of http://archive-server.liveatc.net/ymml/YMML-YMMB-YMEN-Oct-27-2016-0600Z.mp3
(through to 25min 40sec)
alerting of the incident on tower frequency
Unfortunately Tower isn't covered by the feed.
Listening to the feed over and over, can't find VA740 mentioned though. Unfortunately not the best quality on some freqs that day. Weather wasn't the best.
To add to the poor timing of this and workload, QF580 (Perth - Sydney) was being worked as a possible diversion to YMML due to medical emergency.