First-Due Engine: Line Selection, Water Supply, and the Search Decision
You are the officer of the first-arriving engine at 02:10. A two-story wood-frame single-family house, 30 by 40 feet, has heavy fire showing from a second-floor front window, with smoke pushing from the open front door on the first floor. The nearest hydrant is 320 feet down the street; the second-due engine is six minutes out. Your apparatus carries 750 gallons of water, 800 feet of 1¾-inch hose, and 400 feet of 2½-inch hose. A neighbor reports two adults and a child live there but does not know if they are home; there are no cars in the driveway. Wind is moderate from the front; the temperature is 34°F.
1. State the attack line you deploy, its length, and your entry point. Justify the size with flow and staffing considerations, and identify the condition that would change your answer.
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Decision: Deploy a 200-foot 1¾-inch line with a combination nozzle, stretched dry through the front door to the base of the stairway, with roughly 50 feet of working line left outside for mobility.
Why this size:
- A second-floor fire in a 1,200-square-foot floor area needs roughly 150–200 gpm for an interior attack; a 1¾-inch line with a 15/16-inch tip or a combination nozzle at 100 psi delivers that range.
- The fire is above grade, so the line must be able to turn and advance up a stairway. A 2½-inch line delivers more water but cannot be moved up a stairwell efficiently by a two- or three-person crew.
- The line goes in dry and gets charged at the door so the crew is not wrestling a charged line through the yard in the cold.
Entry point: Front door, toward the stairway. That is the side of the building with the reported occupants and the most direct path to the fire floor; the side door reported by the neighbor is not confirmed clear or open.
What would change the answer: Fire through the roof or fire involving the first floor with the stairway compromised - then a larger line or an exterior/master stream attack from a protected position, because an interior advance would put the crew under a collapsing floor or above the fire.
2. Lay out your water supply plan for the first five minutes, including what you do with the 2½-inch hose and why. Show the arithmetic that drives the decision.
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Arithmetic: 750 gallons ÷ 200 gpm ≈ 3.75 minutes of attack water. That is less than the time typically needed to make the stairway, find the seat of the fire, and knock it down - so tank water alone is a one-shot attempt, not a plan.
Plan:
- Stop at the hydrant long enough to drop the male end of a 2½-inch line at the hydrant for the second-due engine, then proceed to the fire building. You have 400 feet of 2½-inch; the 320-foot span is inside that.
- Keep the attack crew intact. Splitting the two-person crew to lay 320 feet of supply line means nobody is on the nozzle when the first line is needed.
- Tell the second-due engine on the radio exactly what you dropped and where, so it completes the connection rather than improvising.
- Attack on tank water immediately. If the line is not making progress when the low-tank point approaches, back out to the door and hold until supply is established rather than running dry inside.
Watch item: A 2½-inch supply line over 320 feet will not deliver full pump capacity without adequate engine pressure, so the pump operator must charge the supply and then set the attack pressure - they are two separate settings.
3. Given a report of possible occupants, when does the primary search happen relative to knockdown, and how do you protect it?
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Concurrent, not sequential - but only with protection.
- The report is unconfirmed ("maybe home," no vehicles), which is exactly the case where you must search rather than assume vacant. Confirmed-vacant assumptions based on an empty driveway are a common cause of missed victims.
- The stairway serves as both the attack path and the victim escape path, so the charged attack line must protect the stairs before anyone searches above.
- Priority search areas: the bedroom wing on the second floor, closets, and the floor area directly above the fire, in that order. If the front stair is blocked by fire or heat, the search team does vent-enter-search from a ground ladder at the rear bedrooms while the line holds the stair.
- One member stays outside with the neighbor to get names, ages, and bedroom locations, and to confirm whether anyone left earlier. That takes 60 seconds and can redirect the entire search.
- Never commit a search team ahead of the line with no water between them and the fire - a crew searching above an uncontrolled second-floor fire is searching a floor that may already be failing.