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Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology

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Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology ( military-jet-engine-acquisition-technology-basics-and-cost-e )

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138 Military Jet Engine Acquisition Technological advances are normally incorporated in one of three ways: new technologies are integrated into existing engine designs through component modifications1 to correct specific problems, numerous technologies are integrated into a mature engine to create a derivative engine design, or an entirely new engine is developed. The extent of redesign to develop derivative engines varies. For ex- ample, the F110-PW-129 has approximately 80 percent parts com- monality with its predecessor, the F110-PW-100, while the F100-PW- 229 has approximately 20 percent to 30 percent parts commonality with the F100-PW-200 (Kandebo, 1998c, p. 22). In most cases, derivatives of existing engines typically introduce fewer unforeseen technical challenges than entirely new engines. We next briefly describe several tactical aircraft engines that either are currently in the Air Force’s inventory or could be in the near fu- ture. Not included are engines for transport and training aircraft, ex- pendable missiles, unmanned aerial vehicles, and auxiliary power units (APUs).2 These other engines and APUs will also continue to in- tegrate new technologies, with emphasis on the performance, relia- bility, and affordability factors that are most important to their appli- cations. The Air Force’s Engine Handbook (1998) contains summary specifications for a large variety of Air Force engines. EXISTING AIR FORCE TACTICAL AIRCRAFT ENGINES F100-PW-220 This P&W engine is a low-bypass-ratio, mixed-flow, afterburning turbofan used to power Air Force F-15 and F-16 aircraft, having passed military qualification testing in 1985. Under takeoff condi- tions, this engine can produce 23,770 pounds of thrust with the af- terburner lit (“wet”) and 14,590 pounds of thrust with the afterburner turned off (“dry”) (The Engine Handbook, 1998, p. 24). ______________ 1The Department of Defense conducts component modification through what it calls the Component Improvement Program. 2APUs are essentially small turboshaft engines, which are used to provide electrical power or pressurized air. They are either mounted in ground-power carts or are integrated into some aircraft.

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