500 FEET with an Aerobird? What the heck were you doing up there anyway? That's much too high for normal flying of a plane like that IMO. Chances are you are overestimating the altitude but it shows an attempt to fly too high. Planes of that type and most trainers are not meant for that type of stress. Sorry for the loss but ya kinda asked for it and that's not meant in a mean spirited way. There are more crashes in your future but you can control MOST of them by being careful and still have fun.