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Vibration absorbers have been utilized to reduce low frequency interior noise caused by propeller blade passage of turboprop aircraft. This method provides inexpensive tone reduction at a low weight penalty.

Airworthiness became a national concern with the Air Commerce Act in 1926. Continuing airworthiness has become increasingly important because airplanes tend to have long lives. This certainly includes, but goes far beyond the airframe, to include power plant and every essential system: everything needed for safe flying. The designer begins by anticipating and providing for continuing flight safety against the wear and tear of use and the ravages of time and environment. He will provide owners with all the guidance and instructions he knows to keep the airplane airworthy. But the operator is the final and most vital link in this chain – to follow instructions and to feed back to the manufacturer anything unanticipated. As airplanes get older they just need more tender care. Continuing airworthiness is essential.

The Super King Air Model 200 is Beech Aircraft's latest entry into the executive turboprop airplane market. Principal design features include a T-tail empennage and 850 SHP PT6A-41 powerplants widely spaced on a high-aspect-ratio wing. This paper presents a discussion of the preliminary studies of the T-tail and the results of preliminary wind tunnel tests. The rationale and design philosophy for satisfactory stall characteristics are discussed; and the development wind tunnel tests, the flight simulator tests, and the development flight-test program are reviewed.

The Model 77 Skipper is the result of an intensive development program to develop an economical and efficient two-place general aviation trainer. The program was initiated as a flying test bed program which allowed great freedom for Engineering evaluation of various aerodynamic, structural and mechanical concepts. This included the evaluation of different types of tail surfaces, high lift and lateral control devices, engines, propellers, etc. Along with the test bed, other tests were run with radio-controlled free flight and spin tunnel models. The test bed program was followed by the production engineering, testing and certification of the chosen production configuration.

Fatigue analysis of the Beech Super King Air empennage was performed in compliance with the Australian and British certification requirements. The empennage fatigue loads for this analysis were evaluated with the use of an engineering flight simulator. The empennage balance, maneuvering, and gust loads for both the horizontal and vertical tail were determined for various flight conditions. These loads were used for analytical prediction of safe life of the empennage structure.