How to Call a Mayday

The Hardest Transmission You'll Ever Make

A mayday is a firefighter's distress call — a declaration that you or a member of your crew is in immediate danger and needs rescue. It's the most important radio transmission in the fire service, and statistically, firefighters wait too long to make it. The delay between recognizing danger and keying the mic has killed people. Training on mayday procedures isn't optional — it's survival.

When to Call a Mayday

Call a mayday when any of these conditions exist:

• Lost or disoriented — you can't find your way out and your air supply is finite.
• Trapped — structural collapse, entanglement, or any condition preventing self-rescue.
• Low air emergency — your PASS alarm is sounding and you cannot locate an exit.
• Injury preventing self-rescue — fall through a floor, burns, medical emergency.
• Missing firefighter — you've lost contact with a crew member and cannot locate them.

The rule is simple: if you think you might need to call a mayday, you need to call a mayday. It's always better to call one and cancel it than to wait until it's too late. Nobody has ever been disciplined for calling a mayday too early. Plenty have died from calling one too late.

LUNAR Format

LUNAR is the standard mayday format used across the fire service. It gives the IC the five pieces of information needed to mount a rescue:

• L — Location: Where are you? "Second floor, Side Charlie bedroom" or "Basement, near the stairway."
• U — Unit: Who are you? "Engine 7, firefighter Smith."
• N — Name: Your name. If LUNAR is being used by your department, this is your actual name (some departments combine U and N).
• A — Assignment/Air: What were you doing, and how much air do you have? "Assigned to search, 1500 PSI remaining."
• R — Resources needed: What do you need? "I need a hose line to follow out" or "I need RIT for structural collapse."

Example Mayday Transmission

"MAYDAY, MAYDAY, MAYDAY. Command from Engine 7. Firefighter Williams, second floor Side Alpha bedroom. I've fallen through the floor to the first floor. I have 2000 PSI. I need RIT — I cannot self-rescue."

Overcoming Hesitation

Studies on LODD incidents consistently show that firefighters delay calling maydays. Why?

• Pride: "I can handle this myself." Maybe you can — but if you can't, you just burned two minutes of air trying.
• Denial: "It's not that bad yet." By the time it is "that bad," you may not be able to transmit.
• Fear of embarrassment: The culture sometimes punishes vulnerability. That culture is wrong, and it kills firefighters. Any department that gives someone grief for calling a mayday has its priorities backward.
• Never practiced it: If you've never said "MAYDAY" into a radio, the first time shouldn't be when your life depends on it.

The fix for hesitation is training. Practice mayday calls in realistic conditions — in SCBA, in the dark, under stress, with limited air. Make it muscle memory.

IC Response to a Mayday

When the IC hears a mayday:

1. Acknowledge immediately: "Engine 7, Command copies your mayday."
2. Clear the channel: "All units, emergency traffic only on this channel."
3. Activate RIT: Deploy the rapid intervention team to the firefighter's reported location.
4. Get additional resources: Upgrade the alarm. You now have a rescue operation inside a fire operation.
5. Assign a rescue group supervisor to manage the RIT operation so the IC can maintain overall command.
6. Maintain contact: Keep talking to the downed firefighter. "Engine 7, can you activate your PASS alarm?" "Can you move toward a wall?"
7. Conduct PAR: Account for everyone else on the fireground.

Practice Drills

Every department should drill mayday procedures quarterly at minimum. Effective drills include:

• Blackout SCBA drills with a mayday call component — firefighter gets disoriented, calls mayday, and self-rescues while RIT deploys.
• Radio-only tabletops — IC practices receiving and managing a mayday from the command post.
• Stress inoculation — physical exertion followed immediately by a mayday transmission. This trains the brain to function under adrenaline and air hunger.

A mayday is not a failure. It's a tool. Teach your people to use it early and use it correctly. The alternative is a funeral.