Mode-S Codes Set To Replace SSR Codes

Aviation International News » April 2008
March 31, 2008, 5:33 AM

A Lufthansa Boeing 737 recently became the first aircraft to use mode-S capability to transmit its radar identification (flight ID), without the use of a secondary surveillance radar (SSR) code. The 737 flight crew was able to automatically correlate the aircraft’s electronic flight plan data by entering a 24-bit code into the aircraft computer. Rod Marten, who oversees mode-S operations at Eurocontrol, said a 24-bit code is necessary because the short supply of four-digit SSR codes–4,096 in total–requires European controllers to make an average of 20,000 code changes a day and duplicate aircraft codes. There are approximately 17 million 24-bit codes, however.

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