EC03-0311-05 U.S. Air Force C-17 transport aircraft, tail number 0025, is being used by NASA Dryden and other NASA centers, the U.S. Air Force, Boeing, and Pratt Whitney in the Propulsion Health Management PHM portion of the Integrated Vehicle Health Management IVHM program. The program is using a USAF C-17 transport in an effort to enhance aircraft safety by enabling early electronic detection of potential problems with aircraft engines and associated systems. December 4, 2003 NASA Photo / Jim Ross C-17 Project Description