At Maroochydoor? then its not an Airbus thing, i have flown into maroochy quite a few times, mostly in QF 737's and on most occasions the speed brakes have been deployed for the later part of the decent onto final, i think it has something to do with airspace limitations and flying over airfields such as caboulture and redcliff, every time the approach has been to the north, a few miles off the coast, then turning west, then north again onto finals.