Flight investigations of single-axis attitude stabilization have been conducted during low-speed instrument approaches. A single-rotor helicopter that had been modified to include an electronic control system was used in the investigation. Pilots' opinions and a simplified statistical analysis of the pilots' control and helicopter motions were used for evaluation.nResults indicated that heading stabilization provided considerable improvements in calm air but was actually detrimental under variable-wind conditions for the task performed. This latter finding was probably the result of the characteristics of this particular control system. Roll stabilization provided only minor benefits in calm air and showed no improvements in varying winds. Conversely, stabilization in pitch provided benefits which were significant in both calm air and in varying winds.
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