2015-09-06
361
The SSR system provides for six modes; only two modes are used in civil aviation: — Mode A for civil and military identification. ~ Mode C for automatic pressure altitude information. ____The SSR is a valuable tool for automatically identifying aircraft. Identification is achieved by providing the controller with a specific radar beacon target identity of aircraft. A total of 4096 discrete reply codes are available for «special position identification» to be transmitted on request of a controller. With SSR display, the controller sees aircraft returns on his PPI as two slashes, clearly distinguishing them from primary targets which are single blips.
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