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110 Military Jet Engine Acquisition early augmented turbofan programs experienced serious develop- mental problems. The major technical problems revolved around inlet airflow and compressor stall. There were also problems with re- liability and maintainability. The P&W TF30 was the first operational afterburning turbofan, and so it was a challenging development. P&W had experimented with a duct-burning turbofan in 1956, but the TF30 burned both fan and turbine exhaust air in the same afterburner. The TF30 began devel- opment in 1959 in support of what later became the TFX program in 1961. The TFX program, which resulted in the General Dynamics F- 111, called for the development of a large supersonic fighter/bomber to meet both Air Force and Navy carrier-borne aircraft requirements. The government selected two airframe and engine finalists in Jan- uary 1962: General Dynamics/Grumman teamed with P&W and Boeing teamed with GE. Secretary of Defense Robert McNamara overruled the source selection team’s choice of Boeing, and in late 1962, the selection team awarded the GD/Grumman/P&W team what was, at the time, the largest aircraft development and produc- tion project in history.8 The TF30 went through at least 12 years of development and various fixes before its reliability and performance became operationally ac- ceptable, yet all of its problems had not yet been solved. Flight test- ing by GD of the F-111 with the P&W YTF30 engine began in 1964. From the very beginning, developmental testing showed serious en- gine problems with compressor stall and catastrophic rotor failure at high speeds. At great expense in money and time, GD, P&W, and the government attempted to solve these problems with several re- designs of the aircraft’s engine inlet, but the problems were never totally fixed. The Navy withdrew from the F-111 program in 1968 and went on to develop its own air-superiority fighter, the Grumman F-14 Tomcat. This new Navy fighter also used the TF30 engine. Like the F- 111 program, the TF30 experienced serious developmental problems on the F-14 program. The TF30 program had been a pioneering de- velopment effort, but its many problems seriously damaged P&W’s reputation with both the Air Force and the Navy (St. Peter, 1999). ______________ 8For a more detailed discussion of this controversial decision, see Lorell and Levaux (1998).PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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