Flight QF643 departed Sydney en route to the Western Australian capital at around 8.40am, but turned back after only 25 minutes.
The flight landed normally and taxied to the gate without issue after the captain requested a priority landing.
The plane was met by emergency services after it landed, however no injuries have been reported.
It is understood no smoke was seen in the cabin.
A PAN was declared by Air Trafffic Control , which is a standard urgency signal.
AzVision.az
