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originally posted by: Zaphod58
a reply to: miniatus
A NORMAL engine run. A burn in or wear check of a new engine type or major fix check, as I said above will go a lot longer before they take it and borescope it. The Air Force is looking at trying to save a lot of money through improving fuel efficiency. That means making performance improvements to engines among other things. You don't make those changes and then just hang the modified engine off the wing. You run it for a long time on the ground and check every portion of it for unexpected results, then run it some more.
Wright-Patterson is the major engineering center for the Air Force. They make and check all those changes there and test a lot of things there.
originally posted by: Zaphod58
a reply to: miniatus
Engine runs can take anywhere from a few minutes to a couple of hours depending on what the run is for.