What is the SSR code 2000?

Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder. (Codes 2001 to 2077 are available for domestic purposes.) Series 75 — Code 7500 is reserved for recognizing an aircraft subject to unlawful interference.



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Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder. (Codes 2001 to 2077 are available for domestic purposes.) Series 75 — Code 7500 is reserved for recognizing an aircraft subject to unlawful interference.

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7000 is a code that VFR traffic will transmit so they can be seen by ATC stations. They may not be talking to that ATC , but if they can be seen by them, that ATC unit can vector other aircraft that it is talking to out of the way of the 7000 aircraft.

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If you're below 18,000, feet you'll start by squawking 7600, then descend or climbing to an altitude that is acceptable for VFR cruising. You'll be expected to land as soon as practical while maintaining visual flight rules. If you're above 18,000 feet (Class A airspace) it gets a bit more complicated.

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If you're already in communication with ATC, you shouldn't squawk 7700 unless the controller tells you to do so. However, if you're not in communication with ATC, squawking 7700 while transmitting on 121.5 is a quick way to get help.

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A discrete transponder code (often called a squawk code) is assigned by air traffic controllers to identify an aircraft uniquely in a flight information region (FIR). This allows easy identification of aircraft on radar.

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0000: this code shall not be used. It is a non-discrete code. It is usually displayed on IVAO pilot software in case of some specific technical problems. 7777: Non-discrete code used to test transponders and to check correctness of radar stations.

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Squawking 7700 in an emergency The most well know of these is the code 7700. This is used to indicate an emergency of any kind. A pilot will enter this when in an emergency situation - either instructed by ATC after declaring an emergency or without communication if there is no time.

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Military aircraft operating in restricted/warning areas or on VR routes will squawk 4000 unless another code has been assigned or coordinated with ATC.

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If the 7500 squawk code is mistakenly selected, the pilot will immediately receive a call from air traffic control asking for confirmation. At this point, the pilot in command or the first officer is able to inform the transponder code has been used by mistake, and that there is no hijacked aircraft.

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Reserved codes are used in particular situations when an aircraft wants to communicate something to ATC urgently. The most well know of these is the code 7700. This is used to indicate an emergency of any kind.

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