The Effect of a Light Aircraft Stability Augmentation System on Pilot Performance

A simple wings-leveling device for light aircraft, and the effect of this device on the instrument flight performance of non-instrument qualified private pilots were evaluated. Experienced research pilots found overall system performance acceptable. However, slightly lower rate capability and slightly higher control forces than desired were present. Non-instrument qualified private pilots were provided with an increased capability to recover from an inadvertent instrument flight situation. Limited navigation and communication tasks, beyond the capability of the pilot while controlling the basic aircraft, could be performed with system aid. Control wheel force developed by the system as a function of bank angle in a steady turn was found to be a definite instrument flight aid.