The impossible aeroplane

Among the "pages" of the Book of Blueprints, a collection of electronic records created by the previous inhabitants of The Pit, there is one mysterious entry. An entry which was found on The Surface layers, which breaks one of the most basic principles that rule the reality within The Pit. The No flying in The Pit rule, a mysterious rule which prevents anything that comes from The Pit to fly in its main shaft. Anything, no matter how many propellers, wings, or engines it has, falls down like a rock once it enters the main shaft. As of yet the only thing that could break that rule were the Beasts from Above.
The blueprint for the impossible aeroplane.

Why impossible?

The name of the invention was chosen by the people who rediscovered the blueprint. It is impossible because due to the corruption of the data of the file, it is impossible to finish the vehicle. If one tried to follow the instructions as they are now written down, they would get a normal aeroplane, with missing parts of the engine. There is also a mention of some other device that needs to be attached to the aeroplane, but no records of its name or its structure are left within the file itself.

Conspiracy theory

According to some programmers, both the corrupted and clean data seem way too clean. They always show up within the areas of the file describing anything that would distinguish the invention from being a simple plane and almost never show up in other areas. According to some conspiracy theorists, someone or something corrupted the files with premeditation. But the real question is not who but "Why?".