![]() ![]() Broadcasting “0000” on power-up will allow ATC automation systems to process the ADS-B data for presentation to air traffic controllers. ![]() This revision reserves Code 0000 for certain Automatic Dependent Surveillance-Broadcast (ADS-B) units that do not detect and set the ATC-assigned beacon code unless the aircraft is in secondary surveillance radar (SSR) coverage. You've quoted the E revision the latest (as of writing this) G revision (issued September 30, 2021) may have the answer: ![]() Why should you never squawk 0000 in the USA? I set my transponder to 1200 after IFR flights, and am considering changing to follow NASA's recommendation of 0000 instead, but I don't want to create headaches for ATC if they see it one day on their scope. If you set 0000, a casual glance at the transponder will indicate "Some part of our preflight did not get accomplished" rather than "Ah the other guy must have set our code already". The idea is to set a code that could never be correct. (Setting 1200 on the transponder may lead a controller to believe the target is normal VFR traffic.) Additionally, should a flight depart without setting an appropriate IFR code on the transponder, ATC will be more likely to quickly detect the problem. Resetting the transponder to 0000 (four zeros) after landing can help you, or the next crew, detect lack of a PDC. ![]() However, NASA recommends that crews set 0000 after landing to help detect when a clearance has not been received. Code "0000" should never be assigned or used. ![]()
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