This is why NASA intentionally crashed a plane

The controlled impact demonstration took place in 1984

Updated: 

NASA Armstrong Flight Research Centre recently uploaded a video of a 1984 controlled impact demonstration.

A Boeing 720 was crashed to test a fuel additive to suppress fire.

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The additive had previously shown the capability to inhibit ignition and flame propagation.

While the test caused a cabin fire, research from the program did help in establishing future safety rules.

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