<p>Many manual control tasks performed by the pilot cannot be reduced to a single-loop tracking scheme; they require the consideration of the pilot-aircraft system as a multi-loop, multi-channel, or multimodal system. This complicates experimental studies and causes many issues related to such tasks to remain underexplored. In this paper, a series of experiments were performed to identify patterns in the characteristics of the pilot-aircraft system in multimodal control tasks, wherein the pilot perceives vestibular and proprioceptive cues in addition to visual ones. A modification of the optimal control model of the pilot is proposed that takes into account the influence of various types of inceptors and their characteristics on the pilot-aircraft system, as well as factors in the pilot’s perception of acceleration cues. An additional modification was introduced to the optimal control model, making it possible to eliminate the difference in pilot actions compared to experimental data in the low-frequency range in a command signal tracking task.The results obtained made it possible to factor in the influence of motion on the performance of disturbance rejection and target tracking tasks in the lateral control channel during the mathematical modeling of the pilot-aircraft system. Comparison of the results of mathematical modeling and experimental studies of the system demonstrated their agreement.</p>