On April 19, 1988, an F-4 aircraft, complete with engines, mounted on a rocket sled, struck a reinforced concrete wall at a speed of about 480 mph. The wall was 3.66 metres thick. The purpose of the crash test was to evaluate the dangers in the event that terrorists purposefully crashed aircraft into nuclear plant buildings.
The test's objective was to measure the impact force against time caused by the collision of an entire F-4 Phantom, including both engines, with a huge, mostly stiff reinforced concrete target (3.66 metres thick). Similar speeds were employed in earlier experiments with F-4 engines. The purpose of the test was not to show how well (or how long) a specific type of concrete structure would hold up under an aeroplane collision.