Alerts & Learnings Human Factors in Design As the driller reached for the microphone, he released pressure on the brake slightly. The top drive descended, bending the drill pipe which fortunately did not spring out. A 27kg pipe-guide fell 90 feet to the floor, narrowly missing the roughneck. Download Learning Moment Rate this Learning Moment Your Rating Average Rating Share: Share on Linkedin Share on Facebook Share on Twitter Share with Email