The measurement of aircraft performance and stability and control after flight through natural icing conditionsThe effects of airframe icing on the performance and stability and control of a twin-engine commuter-class aircraft were measured by the NASA Lewis Research Center. This work consisted of clear air tests with artificial ice shapes attached to the horizontal tail, and natural icing flight tests in measured icing clouds. The clear air tests employed static longitudinal flight test methods to determine degradation in stability margins for four simulated ice shapes. The natural icing flight tests employed a data acquisition system, which was provided under contract to NASA by Kohlman Systems Research Incorporated. This system used a performance modeling method and modified maximum likelihood estimation (MMLE) technique to determine aircraft performance degradation and stability and control. Flight test results with artificial ice shapes showed that longitudinal, stick-fixed, static margins are reduced on the order of 5 percent with flaps up. Natural icing tests with the KSR system corroborated these results and showed degradation in the elevator control derivatives on the order of 8 to 16 percent depending on wing flap configuration. Performance analyses showed the individual contributions of major airframe components to the overall degradation in lift and drag.
Document ID
19860055943
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ranaudo, R. J. (NASA Lewis Research Center Cleveland, OH, United States)
Mikkelsen, K. L. (NASA Lewis Research Center Cleveland, OH, United States)
Mcknight, R. C. (NASA Lewis Research Center Cleveland, OH, United States)
Ide, R. F. (NASA Lewis Research Center Cleveland, OH, United States)
Reehorst, A. L. (NASA Lewis Research Center Cleveland, OH, United States)