It appears as if you're only calling RMimoXY
in your constructor. You should call it every time the ship is moved. So adding it to the end of your keyhandler should work:
function klavesnice(e: KeyboardEvent){
switch(e.keyCode){
case Keyboard.LEFT: lod.x += -5; break;
case Keyboard.RIGHT: lod.x += 5; break;
case Keyboard.UP: lod.y += -5; break;
case Keyboard.DOWN: lod.y += 5; break;
case Keyboard.SPACE: mezernik(); break;
}
RMimoXY();
}