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Air Traffic Control communication is an act of collaboration between pilots and controllers, and the success of this collaboration depends on how smoothly speakers and listeners work together. For example, we have found that the way controllers deliver ATC messages influences how easily pilots understand these messages, which in turn determines how much time and effort is needed to successfully complete the transaction. We first introduced a collaborative framework for investigating air ground comunication and then describe a set of field and laboratory studies that investigated ATC communication. We focused on the impact of ATC message factors (e.g., length and timing) on the cognitive processes involved in ATC communication. These studies also illustrate how the collaborative framework helps analyze the impact of proposed visual data link systems on ATC communication.

The most damaging events controlling the low cycle fatigue life of a mechanical component are typically characterized by a relatively few, large amplitude, low frequency loadings where, for this paper, signals below 60 to 100Hz are considered low frequency. These are usually accompanied by a large number of small amplitude, high frequency loadings that may contribute little or no damage and often are merely a measure of system noise. Over sampling by factors of five to ten relative to the sampling theorem is often recommended to achieve the time domain resolution necessary for an accurate capture of peaks and valleys used in component fatigue evaluation. This over sampling limits the elapsed time capacity of digital recording devices used for field tests, slows data transfer rates, and expands database storage requirements.