Everyone assumes it's CAT (as did I). I was bothered by the QF statements of an "upset". I would've thought that spin doctors would've been shouting CAT from the highest mountains, in light of their recent media drubbing. Then this from the police spokesman
Mr O'Callaghan said he understood the incident was caused by "some sort of systems failure".
from here
Dozens injured in Qantas mid-air incident - News - Travel - theage.com.au