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116 Military Jet Engine Acquisition counter-rotating spools. GE’s ATES efforts examined a series of dif- ferent design approaches, including variable-cycle engines. ATES was followed by the Propulsion Assessment for Tactical Sys- tems studies, which teamed the competing engine developers with the competing airframe integrators to conduct more-advanced de- sign studies. During this period, GE decided to adopt a variable-cycle engine concept, which had been demonstrated in various advanced technology programs. In 1984, GE also demonstrated and adopted another novel technical approach: a counter-rotating vaneless inter- face between the high-pressure turbines (HPTs) and low-pressure turbines (LPTs). In September 1983, GE and Pratt were awarded contracts to develop prototype ground-test engines to demonstrate the technical capabil- ity to develop supercruise, two-dimensional nozzles, and 30,000 pounds of thrust for the new ATF engine. These demonstrator proto- types did not have to meet the weight requirements necessary for flight testing. After a little more than four years, government officials originally planned to select one design to enter into a six-year, full- scale development program, during which flight testing and devel- opment would occur. P&W’s XF119 ground demonstrator engine focused on technical is- sues such as reducing the number of compressor stages in order to lower costs and weight and increase reliability. GE’s XF120 ground demonstrator engine moved ahead using the more complex variable- cycle engine concept with the vaneless HPT-LPT interface. The XF120 was also a very-low-bypass leaky turbojet but used a variable- bypass system based on a fairly complex double-bypass concept. Both engine designs employed counter-rotating spools. In the mid-1980s, several changes implemented by the government and the airframe prime contractors had a major impact on the en- gine program. In 1985, the Air Force lowered the production unit price target and applied more stringent LO requirements to the ATF engine. More important, in mid-1986 the Air Force decided that the engine contractors must flight test their demonstrator engines before final down-select and the beginning of Engineering and Manufactur- ing Development (EMD), formerly called Full Scale Development. This meant redesigning the demonstrator engines to flight test thePDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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