This Youtube video appears to show a brief exerpt from a 15-minute film produced by the FAA in the 1960's. A DC7 was loaded with sensors and its fuel tanks filled with colored water, then sent down a runway filled with obstacles designed to intentionally destroy parts of the aircraft. The footage has been slowed down and reversed. It is the same insert seen briefly in The Plastic Eaters.
With thanks to Michael Seely and the original uploader x2501x