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This paper reviews powerplant operational and maintenance procedures with the objective of minimizing fuel consumption and total operating costs of existing large turbofan engines. Specific recommendations are made to reduce the rate of on-wing performance deterioration and to define cost effective performance refurbishment. Measures being taken to accomplish further fuel and cost savings in the future are summarized. These include design performance retention improvements and development of per-formance diagnostic/analytical systems to permit better management control of engine operating costs.

Significant design features of the thrust reverser and spoiler of the CF6 engine (powerplant for the McDonnell Douglas DC-10) are described, along with the design impact of major requirements including maintainability and noise reduction. Also included is the development test program which is designed to provide accelerated component and system evaluation.

A Computer Aided Process Planning (CAPP) system is being implemented in the manufacture of rotating components for aircraft engines. The system provides a process planning data base and a set of computerized techniques, all easily accessible from a multiple function computer graphics work station. This paper briefly describes the use of CAPP as contrasted with the traditional approach to process planning. The development of the system, the technologies involved in its design, and the implementation approach are also discussed.