Annoying Saab 340 Sound

There is an annoyingly loud air-conditioner or APU-type sound that starts just as you load the AeroSim Saab 340 aircraft. It's louder than the engines, even in external view, and I find it very annoying, and would like to get rid of it. Unfortunately, I've looked everywhere, played each and every sound file, and still can't find the culprit! I've even used other twin-prop sound files, so the problem must be originating in the A340 aircraft.cfg, perhaps accessing a sound file in the root FS9 SOUND folder (I'll look again). Anyone have any ideas?Thanks,http://www.my-buddy-icon.com/Icons/objects/red_3d_plane.gifAlex ChristoffN562ZBaltimore, MD