The Mayday Call, the Pan-Pan Declaration, and the Radio Phraseology Every Pilot Hesitates to Use When They Actually Need It

The Mayday and Pan-Pan calls are the two most important radio transmissions in aviation - and among the least practiced. Knowing the exact format, understanding the distinction between urgency and distress, and building the habit before you need it can be the difference between a recoverable situation and a fatal one.

Where Do “Mayday” and “Pan-Pan” Actually Come From?

Mayday is not an English word. It derives from the French phrase m’aidez, meaning “help me.” It was standardized at an international radio telegraphy conference in 1923, proposed by Frederick Stanley Mockford, a radio officer at Croydon Airport in England. Mockford worked the busiest international air route of his era - London to Paris - and needed a distress call that any pilot or ground station could recognize regardless of native language. The call has been written into International Telecommunication Union standards and adopted by every aviation authority on the planet ever since.

Pan-Pan comes from the French word panne, meaning a breakdown or mechanical failure. It is the urgency call - one level below Mayday in severity - but still a priority transmission that moves you to the front of the radio queue.

What Is the Difference Between a Mayday and a Pan-Pan?

Most pilots learn to think in binary terms: fine, or emergency. The actual framework has three levels: normal, urgency, and distress.

Urgency (Pan-Pan) means you have a situation requiring priority handling, but you are not in immediate danger of losing the aircraft or the people aboard. Examples include: engine running rough with partial power loss, a VFR pilot encountering unexpected IMC with margin remaining, an in-flight medical issue developing, electrical failure with battery time and position awareness, or a tight fuel state that is still workable with priority routing.

Distress (Mayday) means immediate danger to the aircraft or persons aboard. Engine failure, cockpit fire, structural damage, a medical emergency requiring landing within minutes, or significant loss of flight control authority all qualify.

The practical consequence of this distinction: calling Pan-Pan in a Mayday situation means emergency services mobilize more slowly than you need. Calling Mayday in a Pan-Pan situation has essentially no negative consequence. FAR 91.3 gives the pilot in command authority to deviate from any rule necessary in an emergency. The FAA may request a written report after a declared emergency - but a written report and an enforcement action are two entirely different things. If you declared an emergency, resolved the situation, and landed safely, that report will not come back against you unless a pre-existing violation is involved.

When in doubt, escalate. Err toward Mayday.

What Is the Correct Mayday Call Format?

The standard format is outlined in AIM Chapter 6. Every element has a reason.

1. Say “Mayday” three times. Radio environments are noisy. Words get clipped by squelch. The first transmission may be stepped on. Three repetitions also signal immediately to everyone on the frequency that this is not an accidental keyed mic or a student stumbling - it is real and requires immediate response.

2. Name the station you are calling. If you are on a frequency with a known facility, use the facility name: Dallas/Fort Worth Approach, Seattle Center, Memphis Radio. If no known facility is available: any station or all stations.

3. Your complete callsign. Not just the last three characters - your full registration. November Two Five Four Tango Foxtrot. The controller needs the complete identifier to call you back.

4. Nature of distress - keep it short. Engine failure. Fire in the cockpit. Medical emergency on board. Lost VFR in IMC. One clear phrase. The controller needs to know what resources to mobilize in the next thirty seconds.

5. Your intentions. Declaring emergency, requesting vectors to nearest airport. Attempting restart, maintaining altitude. Precautionary landing, looking for suitable field below me. This tells the controller what kind of assistance to provide and what to coordinate.

6. Your position. If on radar, the controller already has you. If not, give them your best information: position relative to a known fix, VOR, town, or airport. Twenty miles northeast of Roanoke. Five miles southeast of the field at two thousand feet. If all you have is a heading and elapsed time since your last known position, give them that. Something is always better than nothing.

7. Souls on board. Everyone in the aircraft - including yourself. First responders need to know exactly how many people to account for.

8. Fuel remaining - in time, not gallons. One hour. Forty minutes. Ninety minutes. A gallon of fuel in a Cessna 172 and a gallon in a King Air are entirely different things. Time translates across every airframe.

A complete call sounds like this:

Mayday, Mayday, Mayday. Kansas City Center, November Two Five Four Tango Foxtrot. Engine failure. I’m attempting a forced landing, looking for a suitable field. Position twenty-two miles southeast of Emporia, descending through four thousand feet. Two souls on board, forty-five minutes fuel.

That transmission takes approximately fifteen seconds.

What Does a Pan-Pan Call Sound Like?

The Pan-Pan call follows the identical structure. The only change is replacing “Mayday” with “Pan-Pan” three times, and describing urgency rather than immediate distress.

Pan-Pan, Pan-Pan, Pan-Pan. Memphis Approach, Cessna Two Seven Six Romeo Uniform. I have rough engine operation and partial power loss. Requesting priority handling and vectors to the nearest suitable airport. Fifteen miles northeast of Memphis, six thousand five hundred feet. One soul on board, one hour fuel.

Again, approximately fifteen seconds.

What Happens After You Make the Call?

The controller will acknowledge your transmission, confirm your callsign, and ask follow-up questions: aircraft type, equipment on board, ability to maintain altitude, more precise fuel state. These are not bureaucratic checkboxes - they determine whether a runway gets cleared, whether fire and rescue gets prepositioned, and which airport gives you the best outcome.

Answer directly. If you do not know something, say so. If your situation is changing, say that. Controllers handle emergencies regularly and know what they need without wasting your time.

They will offer options: vectors to the nearest airport, an airport with longer runways, a straight-in approach, priority landing clearance with other traffic held or sequenced around you. The controller’s job is to give you as many good options as possible and then let you fly the airplane. Take what helps. If something they offer does not work for you, say unable and tell them what you need instead.

When Should You Call - Before or After Things Get Worse?

Consider this scenario: you are cruising at 8,500 feet and your oil pressure gauge is creeping toward the bottom of the green arc. It has not left the green yet. But it is trending the wrong direction. Oil pressure does not creep without a reason.

This is a Pan-Pan situation. You are not in immediate danger, the engine is running, you have time and options. But a trend that can deteriorate quickly warrants priority handling now - not after the gauge leaves the green.

Pan-Pan, Pan-Pan, Pan-Pan. Albuquerque Center, Piper Two Eight One Victor Alpha. I have an oil pressure indication trending low, engine still running. Requesting priority handling and vectors to nearest suitable airport as a precaution. Position over Santa Fe, eight thousand five hundred feet. Two souls on board, two hours fuel.

That call gets you immediate attention. The controller knows your situation and your position. And critically - if the oil pressure leaves the green arc two minutes later and the engine quits, you have already saved precious seconds in the worst case. The controller knows who you are and where you are before the emergency escalates.

The best time to call is before you absolutely have to.

Squawk 7700 and the Guard Frequency

If you are transponder-equipped, squawk 7700 - the universal emergency transponder code. This paints an emergency label on your target across every radar scope in the national airspace system: approach controls, centers, every terminal radar facility in range. Even if your radio transmission never reaches anyone, 7700 is a continuous, silent declaration of emergency visible to every facility that can see you.

If you are already in contact with a controller, they may ask you to keep your assigned discrete code rather than squawking 7700. Follow their guidance. But if you lose contact or were never in contact with anyone, 7700 is your loudest possible transmission.

If you have lost contact with your assigned frequency and cannot raise anyone, transmit on 121.5 MHz - the guard frequency. It is monitored by military aircraft, most commercial transport aircraft, the Air Force Rescue Coordination Center, and many ground facilities as a secondary watch. An overflying airliner may hear you long before any ground station does, and can relay your position and situation through their own company or through the facilities they are already in contact with.

How to Build the Habit Before You Need It

The Airman Certification Standards for the private pilot certificate require you to know and demonstrate emergency procedures including radio communications. On a checkride, an examiner giving a simulated emergency wants to see you reach for the radio immediately - not reluctantly, and not last.

Practice the format out loud on your next solo. When you run engine-out emergency procedures, say the words - even if you are not on frequency with a facility. Mayday, Mayday, Mayday. Callsign. Nature of distress. Intentions. Position. Souls on board. Fuel.

Say it until it is automatic. Because when you actually need it, automatic is what you have.

Key Takeaways

• Pan-Pan = urgency (priority needed, not in immediate danger); Mayday = distress (immediate danger to aircraft or persons aboard)
• Calling Mayday in a Pan-Pan situation carries no meaningful penalty - FAR 91.3 protects you; always err toward escalating
• The standard emergency call format covers: three repetitions, facility name, full callsign, nature of distress, intentions, position, souls on board, and fuel remaining in time
• A complete Mayday or Pan-Pan transmission takes approximately fifteen seconds
• Squawk 7700 is a continuous radar-visible emergency declaration; 121.5 MHz (guard) is the backup radio channel monitored by military, commercial, and many ground facilities
• Make the call before things get worse - getting the controller’s attention while you still have options saves critical seconds if the situation deteriorates