While waiting for the U.S. Air Force to decide whether to change the B-52H’s engines, Pratt & Whitney has gone ahead to propose an upgrade package that will improve the fuel and maintenance performance of its existing TF33 turbofan.
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By Ronnie Macdonald from Chelmsford, United Kingdom [CC BY 2.0], via Wikimedia Commons
![347592_original[1]](http://alert5.com/wp-content/uploads/2015/06/347592_original1-500x358.jpg)