This document catalogs the symbols presented with the various
interfaces used by Federal Aviation Administration Airway
Facilities specialists. It includes a high-level overview of each
system and the symbols and coding conventions used. These data were
collected through analysis of software specifications,
computer-based instruction manuals, and field site visits. The
visits to field sites allowed verification of information from
other sources and provided information about the environments that
can affect the discrimination of visual symbols. Researchers used
the information from the Human Factors Design Guide, International
Organization for Standardization standards, and other sources to
provide recommendations for visual symbols. The researchers used
this information to evaluate the symbols used at Maintenance
Control Centers, taking into consideration the observed
environmental conditions, and provided recommendations toward a
goal of symbol standardization.
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