var a_array:Array = [1, 2, 3, 4];

var loader:Loader = new Loader();
loader.load(new URLRequest("sub.swf"));
addChild(loader);

stage.addEventListener(MouseEvent.CLICK, clickHandler);

function clickHandler(event:MouseEvent):void
{
	if (this.parent.parent.hasOwnProperty("a_array"))
	{
		trace(MovieClip(this.parent.parent).a_array);
	}
}