Mayday Traffic on a Shared Fireground Channel
You are the company officer on the first-arriving engine at a two-story wood-frame dwelling with fire showing from the A side, Division 1. Your crew of four has a 1,500 gpm pump and a hydrant 150 feet away. The department uses one dispatch channel and one fireground channel. The fireground channel is currently carrying three simultaneous transmissions, including a chief giving an extended size-up without releasing the key. At 02:14 a firefighter on your crew transmits "Mayday, mayday, mayday," but the transmission is stepped on. You hear only "...ayday... trapped... second floor." The incident commander is on the dispatch channel requesting a second alarm.
1. What do you do in the first 30 seconds to establish effective mayday communications?
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I go to emergency traffic immediately. On the fireground channel I transmit a clear, short message: "Emergency traffic, emergency traffic, mayday on the fireground, clear the channel." I repeat my unit and the mayday until the channel is quiet. The chief's size-up and routine traffic stop.
Reasoning: a stepped-on mayday is not a mayday the IC can act on. The priority is to seize the channel and make everyone stop transmitting so the trapped firefighter or a nearby crew can be heard. I do not wait for the IC to move off the dispatch channel; I acknowledge the mayday on the fireground channel and tell the IC to switch to the fireground channel for the mayday. I also send a runner or use a face-to-face if the radio path stays congested.
2. What information must be collected, and how do you get it if the original transmission was incomplete?
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I need the LUNAR elements: Location, Unit, Name, Air supply, and Resources needed. The original transmission gave only a partial location ("second floor"), so I treat that as unconfirmed.
How to get it: I ask the mayday firefighter directly, in short prompts, one at a time: "Mayday unit, give me your location," then "what is your air," then "what do you need." If there is no answer, I do not keep calling repeatedly and blocking the channel. I ask the crew that was with him, check the accountability board, and send the rapid intervention crew toward the last known location. If radio fails, I use a cell phone, a relay through another unit, or face-to-face contact. The goal is a confirmed location and air status, not a perfect report.
3. How do you manage the radio channel to support both the mayday and the fire attack?
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The mayday gets a dedicated channel and a dedicated person. I recommend the IC or a designee take the mayday channel and stop taking routine reports on it; fire attack moves to the tactical channel or is directed by another chief. I announce the channel split clearly so units know where to go.
Reasoning: continuing fire attack and rescue on one channel guarantees that critical traffic is stepped on. I keep my own transmissions to benchmarks: mayday acknowledged, RIC deployed, location confirmed, victim removed, mayday terminated. I do not allow the mayday to be closed until the firefighter is accounted for and the IC announces it. Afterward, I preserve the radio log and record the timeline for the after-action review.