Problem?

[N1TPH]

Is 7600 squawk an emergency? Was just looking at my tar1090 display and a JBU was squawking 7600 (the line was all red), then it dropped off, then no ADSB. I tried to capture screen but no joy.

 

[bubbaearle]

According to Google:


In aviation, squawking 7600 is the universal transponder code used to alert Air Traffic Control (ATC) that an aircraft has suffered a two-way radio failure (lost communications). This discreetly signals to controllers that the crew can no longer transmit or receive voice messages.

Entering this four-digit number into the transponder triggers a specific emergency protocol that allows ground facilities and other aircraft to react accordingly:

• Radar Identification: The 7600 code pops up on ATC radar displays with a specific flag, warning controllers that the aircraft is "NORDO" (No Radio) so they can clear its airspace and expect non-standard procedures.
• IFR Procedures: If flying under Instrument Flight Rules, pilots will generally follow the last assigned route, altitude, and speed clearance until they reach their destination.
• VFR Procedures: If flying under Visual Flight Rules, pilots typically maintain visual contact with the ground and plan to land at the nearest suitable airport.
• Visual Signals: When approaching controlled airports without a radio, controllers will observe the aircraft and use an ATC "light gun" to shoot directed beams of colored light (red, green, or white) from the control tower to clear the plane for landing or taxiing.

 

[JimmyJet727]

In aviation, squawking 7600 is the universal transponder code used to alert Air Traffic Control (ATC) that an aircraft has suffered a two-way radio failure (lost communications). This discreetly signals to controllers that the crew can no longer transmit or receive voice messages.

Correct. 7500 is highjacking. 7600 is radio failure. 7700 is emergency.

 

[bubbaearle]

7900 Aircrew ate the fish

 

[Colin9690]

If Radio failure occurs, pilots generally proceed as filed or according to their last ATC clearance. Departure and arrival charts have specific lost communication procedures.

Squawking 7600 while proceeding inbound to an airport alerts the control tower to signal the aircraft using a light gun. In daytime, the aircraft will rock its wings as a sign of acknowledgment. At night, they might flash their landing light.