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112 Military Jet Engine Acquisition part through years of problems with the TF30 on the F-111 and the F-14.10 The F100 was an extremely innovative engine that pushed the boundaries of contemporary technology, especially in the area of exotic high-temperature materials. A tight Air Force schedule and budget left little room for dealing with the inevitable technical prob- lems, schedule slippage, and cost growth. In June 1971, the Navy pulled out of the program because of continuing technical develop- ment problems, dramatically increasing the program costs for the Air Force. Not only did development problems continue through full- scale development and flight testing, but the engine went into pro- duction before development was completed. Fixes done under gov- ernment-funded Component Improvement Programs continued after the engine entered service with the F-15 in late 1974. The engine was extremely powerful and capable but continued to experience se- vere operational and reliability problems. The F100 engine was so powerful and the F-15 so maneuverable that pilots began pushing the aircraft to the edge of the performance en- velope in ways that stressed the engine far more than had been antic- ipated. These stresses resulted in much worse reliability and mainte- nance problems than were originally expected. In addition, new heavy-maneuvering air-to-air combat tactics developed by Air Force pilots revealed another problem: compressor stall caused by strong dynamic airflow distortion in the engine inlet. Severe compressor stall could lead to engine flame out, requiring the pilot to restart the engine in flight. This problem caused particular concern because the F100 was planned for use on the single-engine General Dynamics (now Lockheed) F-16 as well as on the dual-engine F-15. The com- pressor stall problem also contributed to another major shortcom- ing—turbine blade fatigue and failures that had the potential of destroying the aircraft in flight. To avoid potentially catastrophic accidents, performance limitations were placed on pilots, and mechanics had to de-rate the engine. ______________ 10There are several studies of the development of the F100 and the resulting “Great Engine War” between P&W and GE. They include Camm (1993); Ogg (1987); Drewes (1987); Kennedy (1985); and Mayes (1988).PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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