Table 1-2 illustrates that the subject of modifying engines and re-engining aircraft for various reasons has been studied extensively. However, two factors distinguish this study from the previous studies: (1) the selection of candidate systems herein is based mainly on their ability to reduce the Air Force fuel burden and (2) consideration is given to the entire fleet of large nonfighter aircraft. The following chapters analyze in depth the methodology for selecting the candidate systems for modifying engines and re-engining aircraft; additional factors that may reduce aircraft fuel consumption; promising alternative fuels and engine developments that may one day impact fuel consumption; and innovative contracting and financing approaches that the Air Force may employ with industry to reduce engine development and sustainment costs.



AFSAB (Air Force Scientific Advisory Board). 2006. Technology Options for Improved Air Vehicle Fuel Efficiency: Executive Summary and Annotated Brief. SAB-TR-06-04. Air Force Scientific Advisory Board, Washington, D.C., May.

AFM (Air Force Magazine). 2006. The Air Force in Facts and Figures—2006 USAF Almanac. May. Available online at Last accessed on January 22, 2006.

DESC (Defense Energy Support Center). 2005. Fuel Used for Large Non-Fighter Aircraft for Calendar Year 2005.

Pudas, Terry. 2005. A strategic approach to energy in the Department of Defense. Defense Technology International. May/June. Available online at Last accessed on January 22, 2006.

Sega, Ron. 2006. Air Force Energy Strategy. April 19. Available online at Last accessed on September 11, 2006.


William Harrison, Director, National Aerospace Fuels Research Complex, Air Force Research Laboratory, “Alternative fuels overview,” Presentation to the committee on June 13, 2006.

Ann Karagozian, Chair, Air Force Scientific Advisory Board, “Quick-look study on technology options for improved air vehicle fuel efficiency,” Presentation to the committee on May 23, 2006.

John Over, Director, 448th Combat Sustainment Wing, Tinker Air Force Base, “Re-engining and engine modernization from a sustainment perspective,” Presentation to the committee on May 23, 2006.

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