Chances are you haven’t heard of it. But as of last summer, Europe officially has introduced a new special purpose squawk code. 7601 was introduced to allegedly remove a layer of uncertainty when communications have broken down. But not all European countries agree on its usefulness.
What is a squawk code?
Many flight tracking enthusiasts are familiar with squawk codes. In short, every aircraft equipped with a transponder is assigned a four-digit code by air traffic control. For controllers on the ground, this code then helps distinguish each aircraft from each other. This in turns provides clarity in an airspace that gets more crowded each day.
A trio of codes carry a special, universal meaning and are recognized globally:
7700 — General emergency
7600 — Radio communication failure
7500 — Unlawful interference
Aircraft broadcasting these codes will be flagged on Flightradar24, usually drawing a lot of attention. You can learn the ins and outs of these in our blog post about squawk codes. As of May 2025, a fourth special code has joined the list in European airspace: 7601.
What squawking 7601 means
Like its more famous brethren 7600, squawk code 7601 is used when an aircraft operating under Instrument Flight Rules (IFR) loses its ability to communicate with the outside world. This covers all forms of available communication. Radio, digital communications via ACARS, even cellphone usage if within coverage. The new code however allows pilots to better communicate their intentions in case of such a complete radio failure.
By squawking 7601, pilots let controllers know that they will abandon Instrument Flight Rules and continue to the closest suitable airport. It is also assumed that the weather allows for pilots to navigate there using visual cues and references.
This is distinct from squawk 7600, which remains the correct code when a pilot loses comms but continues to fly their IFR clearance. This can be both in instrument meteorological conditions (IMC) or in VMC (visual meteorological conditions). The point is that they will stick to their flight plan. For an air traffic controller, this subtle difference is quite important.
With 7600, controllers know they must protect the airspace along the aircraft’s filed route. With 7601, the aircraft instead has effectively stepped outside the IFR framework and is navigating visually to land at the nearest airport.
Where is 7601 used?
The new code was introduced as part of a broader update to Europe’s Standardised European Rules of the Air (SERA) and came into force on May 1st, 2025. Squawk code 7601 is now part of the official canon across all EU member states. However, since SERA is an EU regulation, non-EU countries in Europe have the freedom to choose whether or not to adopt it.
You guessed it, here’s where it gets interesting (or confusing, depending on how you view things). At the time of writing, non-EU countries the United Kingdom and Switzerland have decided not to implement the use of 7601. Nonetheless, when pilots of aircraft registered in these countries enter EU airspace, they are expected to be aware of and prepared to follow the rules if a comms failure were to occur.
Is it needed?
In true non-academic fashion, yours truly reached out to a few pilot friends who fly commercially in Europe. I wanted to hear what their thoughts were on the subject. Some acknowledged that an added code is useful. Especially as this particular one after all would be used to differentiate between scenarios when clear comms aren’t an option. Others I spoke to said that 7600 more or less already is enough, effectively echoing the official stance of the United Kingdom.
What is your opinion? Is 7601 a good addition? Or is the current arsenal of special codes enough?
Let us know in the comments below.
2 Responses
Yes 7601 seems a discreat code to communicate the RCF and loss on all equipments like ACARS etc. And pilots intention to abandon IFR and changing flight rules to VFR and land to the closest possible airport
IMHO 7600 squawk code should remain covering all radio outs. It’s already universal You are busy enough