A Loader object can load swf movies. AltLoader was developed to load text files.
An instance if the Loader class is a visual object that should be added to the display list.
So what you should do instead is

code:
var ldra:Loader = new Loader();

addChild(ldra);

ldra.load(new URLRequest("QM-SWF-01.swf"));


or if you want it to be a child of mc1

code:
var ldra:Loader = new Loader();

mc1.addChild(ldra);

ldra.load(new URLRequest("QM-SWF-01.swf"));