before it fell 30,000 some feet flight 8501 was apparently climbing. that's what a source tells reuters saying specifically the jet made an unbelievably steep climb nicole politzi source came to this conclusion after apparently seeing radar data from the plane and here's more of what this source told reuters and i quote, so far the numbers taken by the radar are unbelievably high. this rate of climb is very high too high. it appears to be beyond the performance envelope of the aircraft. now cnn has not been able to independently verify this report but with me now to discuss is the author of "why planes crash" david soucie. what do you make about this possible radar report this pilot had 20,000 hours of flying. would he have known just how hard he could push this plane? >> i would like to make sure people understand what climb versus speed versus angle of attack and all that stuff is. just take a second.