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The military aviation services pay a phenomenal price due to turbine engine stall. Several of the major factors which comprise a substantial portion of the total price are presented. Included are weapon system development time, operational limitations, field maintenance problems, overhaul costs and accident rates. Also presented, in a general fashion, are several technical approaches to the solution of turbine engine stall. Fundamental research and orderly development of basic engine components, power control systems, and airframe and installation factors are discussed. Emphasis is placed on the need for tighter control of production tolerances and the requirement for united efforts in the integration of components into a complete system.

To provide maximum comfort for passengers, it is claimed that cabin pressures must be maintained within very-narrow limits. The various steps by which a system was developed to accomplish such control is discussed and illustrated by photographs and diagrams. The author believes that the final result of the research and development program is a system which will not only provide the necessary control, but will do so with a degree of reliability unknown in earlier systems, with a minimum of maintenance and extremely simple in operation. Two production systems are described in detail with a final explanation of how a transistorized pre-amplifier and magnetic amplifier is used.

The detail design and economic requirements of a short-medium range transport are outlined as established by discussions with the air transport industry. The design requirements in relation to the economics of the airplane are discussed, and several airplane configurations are analyzed. Analysis of these configurations indicates that a turboprop-turbojet 60 passenger airplane could be designed which would satisfy the performance and direct operating cost per seat mile requirements. A cruise speed of 400 MPH is obtainable with direct operating costs per available seat mile competitive with depreciated contemporary aircraft. Dimensional, weight and performance data of this design are shown.

The paper on integrated flight systems briefly reviews the growth of flight instruments and automatic flight controls, and points out the need for integrated flight systems. Three manufacturers, namely: Collins, Sperry and Bendix, are producing integrated systems today. Each of these systems is reviewed, with the review centering on instrumentation. The third part of the paper presents airline views on the application of integrated systems and points out installation problems. In conclusion the paper indicates that many changes can be expected in the future as a result of improvements and installation of additional aids.