An electric outside-in attitude gyro display system was prototyped and flown to compare the display with the contemporary inside-out display developed by Elmer Sperry nearly 50 years ago. The outside-in display system was evaluated to be superior in extreme attitudes and the spiral dive problem. The electric prototype was evaluated also to have alternate power source advantage over air gyros on single engine aircraft. Government regulations relative to attitude gyros and displays are concluded not to conflict with outside-in gyros. A concept of control indicator to performance indicators scan is suggested to be considered in this integration of instruments.
