A radio failure sounds frightening, but the FAA has a clear, simple plan for it, and an airplane flies just fine without a working radio. For a VFR pilot the priorities are unchanged: fly the airplane, get to a safe landing, and watch the tower for light signals. Here is the lost-communications procedure, the transponder code to set, and what each light-gun signal means.
Part of our Radio Communications guide. It pairs naturally with towered airport communications.
First, fly the airplane
Losing the radio is not an emergency by itself; it is an inconvenience. Your first job is always to keep flying the airplane and maintain situational awareness. Before assuming the worst, run the simple checks: confirm the volume and squelch, the correct frequency, the headset connections, and the audio panel selections. Many “radio failures” are a knob in the wrong position.
Squawk 7600
If the radio is truly out, set your transponder to 7600, the code that tells air traffic control you have lost communications. It is worth memorizing the three special codes together, because they are easy to mix up:
| Code | Meaning |
|---|---|
| 7500 | Hijack or unlawful interference. |
| 7600 | Lost communications (radio failure). |
| 7700 | General emergency. |
A common memory aid: “75 taken alive, 76 needs a fix, 77 going to heaven.” Setting 7600 lets controllers identify you on radar and help keep other traffic clear.
The VFR principle: continue to a safe landing
For a VFR pilot, the guiding idea is simple. Continue toward a safe landing, remaining in visual conditions, and use whatever tools you still have. If you are near a towered airport, the tower can communicate with you using a light gun, a focused colored light aimed at your aircraft. Stay alert for it, especially as you approach the field and in the traffic pattern, and acknowledge by rocking your wings in the daytime or flashing your landing or navigation lights at night.
Light-gun signals
The tower uses a light gun to send a small set of standard signals. The meaning of each color depends on whether you are in flight or on the ground.
| Signal | On the ground | In flight |
|---|---|---|
| Steady green | Cleared for takeoff | Cleared to land |
| Flashing green | Cleared to taxi | Return for landing (to be followed by a steady green at the proper time) |
| Steady red | Stop | Give way to other aircraft and continue circling |
| Flashing red | Taxi clear of the runway in use | Airport unsafe, do not land |
| Flashing white | Return to starting point on the airport | Not used in flight |
| Alternating red and green | Exercise extreme caution | Exercise extreme caution |
Keep it conservative
Real lost-communications situations, especially under instrument flight rules, can be more involved, and the exact best action depends on the weather, the airspace, and your situation. Treat this page as an overview, review the full procedure with your instructor, and confirm against current official sources. The constants are these: fly the airplane, squawk 7600, stay VFR, and look for light signals.
The gear that helps
What you'll need
The radio gear and references student pilots actually use, all from PilotMall.com.
Frequently asked questions
What transponder code do I set for a lost radio?
Squawk 7600. That code tells air traffic control you have lost communications. For reference, 7500 is hijack and 7700 is a general emergency.
What does a steady green light from the tower mean?
On the ground it means cleared for takeoff. In flight it means cleared to land.
What does a flashing red light mean?
On the ground it means taxi clear of the runway in use. In flight it means the airport is unsafe, do not land.
Is a radio failure an emergency?
Not by itself. The airplane flies fine without a radio. Your job is to keep flying, squawk 7600, stay in visual conditions, continue toward a safe landing, and watch the tower for light signals.