this case. shortly thereafter controllers lost contact with the plane. the flight was scheduled to land at 8:30 a.m. local. here now security expert and former commercial pilot an no any roman. thanks for being with us. you are in that situation. a lot of turbulence. you ask air traffic control, can we deviate, increase altitude, whatever, to get around what s in front of us. sometimes it works, sometimes it doesn t. you hit a situation where you may need to take evasive action. there is something with an airbus a-oh 320 that could be part of the way the particular pilots are getting feedback, if you will, from the equipment. that s true. there is a parameter called flight envelope protection which is basically a series of computers on the a-320. those computers naturally have software parameters. they interpret the pilot s flight control inputs. there have been cases where the