Pilot Performance Enhancement Through Flickering Bars at Varying Frequencies in Attitude Indicators

The aircraft attitude indicator is crucial for flight safety, yet its conventional design may lead to slower responses and reversal errors. This study examined whether flickering bars at different frequencies around the indicator could improve pilot performance.

Forty-five pilots completed a recovery task and a tracking task with a joystick. In both tasks, the attitude indicator was modified by adding bars flickering at five frequencies (0, 2, 4, 6, and 8 Hz). A total of 14 dependent variables were recorded, including response times, reversal error rates, accuracy, and root mean square errors.

Across the 14 dependent variables, 3 showed significant main effects of flicker frequency. Of the nonzero flicker conditions, performance under the 6-Hz bars was generally higher than that of the other frequencies. In the recovery task, the roll reversal error rate at 6 Hz (3.39%) was significantly lower than at 4 Hz (4.64%) and 8 Hz (4.86%). Recovery accuracy was highest at 6 Hz (96.68%), significantly outperforming 2 Hz (95.57%). In the tracking task, initiation times were fastest at 6 Hz (875 ms), significantly shorter than at 2 Hz (1028 ms). Conversely, 2-Hz flickering bars produced the worst outcomes, with the lowest accuracy and longest initiation times. The performance of the 0-Hz (nonflickering) condition was comparable to that of the 6-Hz bars on several measures.

These findings extend prior research on visual salience and redundancy in cockpit display design, offering empirical evidence that flickering frequency influences pilot performance. The results provide practical implications for cockpit instrumentation design. Jiang H, Wen M, Peng X, Yu X, Liu R. Pilot performance enhancement through flickering bars at varying frequencies in attitude indicators. Aerosp Med Hum Perform. 2026; 97(4):249-256.