OK Lord let me explain it more simply, obviously I wouldn't turn back unless I lost both engines. Turkey buzzards can cause that to happen you know just like Canadian geese that Sully dealt with. At 1500 feet could you make a standard 30 degree bank and make it back? No. You could do a steeper bank to maybe 45 to 50 degrees and maybe make it back. If you go straight ahead you crash into the side of a mountain because there is no where else to go. Now do you understand? I can diagram the terrain around TGU if you need it or you can just look it up. That small river isn't going to hack it because it isn't straight and wide like the Hudson.