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THE WORLD’S FIRST PORTABLE AIR TRAFFIC CONTROL SIGNAL LIGHT GUN, Operating in Air Traffic Control towers across the globe, the Signal Light Gun is used by more than 80 civilian and defense agencies worldwide. Voice communications may be impossible. Mission requirements might demand radio silence. But controllers always have a voice with the Model 901 ATC Signal Light Gun. The design and construction of the Model 901 are based on the United States Federal Aviation Administration FAA-2214-a Specification. For More Information Visit at https://atiavionics.com/Read less