Quote:
Originally Posted by Uncle Peter
Yep there is specific equipment wich provides this capability and there is a provision for it's use in the FAA airworthiness approval advisory circular for ads-b. Specifically when a flight plan is not filed and no ATC services are requested (make of that what you will!).
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FAA is nothing too do with RAF equipment. Cockpit crew can not change the code on an RAF aircraft.
As such all RAF transponders (although mode C) will start with 43C