I'd be surprised if it made it to 7,000ft with JetA in the tanks.
VH-XXX, my thoughts exactly. While at first I did wonder about the possibilty of a misfuelling, when I heard that the aircraft had got to 7,000 & 12 miles out then that theory seems unlikely. Many years ago there was the misfuelling of a Cheiftain at Moomba - it didn't get very far off the ground before everything went pear shaped.
DF.