The man piloting the plane that crashed Wednesday on Interstate 15 warned air traffic controllers what was about to happen, but gave no indications of any prior problems, according to radio traffic. âHey, Iâm going down! Six Whiskey Bravo,â Layne Clarke said, referencing the tail number on his single-engine Beech A36 Bonanza â N60WB. âI just saw him go down,â someone said moments later.