A Trent 7000 demonstrator engine has run for the first time,marking another programme milestone for the latest member of the Rolls-Royce Trent family.The demonstrator,which will prove the key technical features of the engine,successfully completed an initial power run,on schedule,on a test bed in Derby,UK.The Trent 7000,the exclusive power plant for the Airbus A330neo,is the seventh member of the Trent family