Pratt and Whitney fly a very unique airborne test bed, a 747 modified specifically for engine testing. You can see it and a hundred different perspectives on ground and flight test of jet engines in this video.
First Fight Video
Ground and Flight Test Video
Video exponentially improves our ability to use picture to communicate 10,000 words, and this is not only one of the fundamental ATOMs but also an elementary and critical element in the strategy to inform and invest. These are just a few of the reasons that this weekly video column exists.