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A user-friendly method for analyzing longitudinal and lateral-directional trim problems for airplanes with all engines operating (AEO) and with one engine inoperative (OEI) is presented. The method allows for rapid evaluation of various critical handling qiality parameters, such as stick-force per ‘g’ and stick-force versus speed gradients. In addtion, the effect of failures in trim systems on cockpit control forces and on control surface and/or tab deflections can be assessed. Also, the method can be used for sizing of tab control systems, down-springs, bob-weights and interconnect springs. Finally, elevator hingemoment derivatives for rather arbitrary aerodynamic balance configurations can be quickly estimated.

This paper describes a simple, self-contained flight test data acquisition system. The system makes use of the latest sensor and microprocessor technology available, to reduce overall system costs. Coupled with this is the use of modern control theory techniques allowing minimization of data requirements, as well as flight time requirements. Capability of the system includes primarily stability and performance analysis of general aviation airplanes, although system versatility has been designed into the package. Presented are details of the prototype system constructed, as well as details of the data reduction technique utilized. Preliminary results of the flight test program have also been included which demonstrate the capability of this system.

The paper presents the results of a study performed under contract with NASA-Langley Research Center to document the state of the art of general aviation (GA) autopilots. The study was conducted to provide NASA-Langley with fundamental, background information about the current status of general aviation autopilot technology. The information presented is based on findings obtained from a general literature search, product literature, visitations and interviews with manufacturers, users, and service centers. Recommendations concerning potential areas of further research are also presented.

The paper summarises the work done by the University of Kansas Flight Research Laboratory on separate surface control systems. Theory, potential applications and a summary of the state-of-the-art of separate flight control technology are discussed.