The Controlled Impact Demonstration was a joint project with the Federal Aviation Administration to research a new jet fuel that would decrease the damage due to fire in the crash of a large airliner.
On 1 December 1984, a remotely piloted Boeing 720 aircraft was flown into specially built wing openers which tore the wings open, fuel spraying everywhere.
Despite the new fuel additive, the resulting fireball was huge; the fire still took an hour to fully extinguish.

Even though the fuel additive did not prevent a fire, the research was not a complete failure.
The additive still prevented the combustion of some fuel which flowed over the fuselage of the aircraft, and served to cool it, similar to how a conventional rocket engine cools its nozzle.
Also, instrumented crash test dummies were in the airplane for the impact, and provided valuable research into other aspects of crash survivability for the occupants.
The Controlled Impact Demonstration was a joint project with the Federal Aviation Administration to research a new jet fuel that would decrease the damage due to fire in the crash of a large airliner. On 1 December 1984, a remotely piloted Boeing 720 aircraft was flown into specially built wing openers which tore the wings open, fuel spraying everywhere. Despite the new fuel additive, the resulting fireball was huge; the fire still took an hour to fully extinguish.
Even though the fuel additive did not prevent a fire, the research was not a complete failure. The additive still prevented the combustion of some fuel which flowed over the fuselage of the aircraft, and served to cool it, similar to how a conventional rocket engine cools its nozzle. Also, instrumented crash test dummies were in the airplane for the impact, and provided valuable research into other aspects of crash survivability for the occupants.
Armstrong Flight Research Center