Types, Components, and Inspection of Aerial Apparatus
Domain 1 covers the hardware: the types of aerial apparatus you may be assigned, the components you must be able to identify, and the pre-operation inspection that decides whether the device goes into service.
Types you must distinguish
- Aerial ladder - telescoping straight boom with rungs, built primarily for access, rescue, and elevated streams.
- Elevating platform (tower) - boom with a basket; rated for personnel, often with a waterway and monitor.
- Water tower - a boom or platform configured mainly as a master-stream appliance, not for personnel.
- Quint - defined by five features: pump, water tank, hose bed, aerial device, and ground ladders. A pump on an aerial does not by itself make a quint.
Components
Turntable and rotation bearing; boom sections, extension cylinders, and wire rope; wear/slide pads; waterway, piping, and nozzle; stabilizer beams, jacks, and pads; load-chart placard; safety interlocks; emergency lowering pump/valve; PTO-driven hydraulic pump, reservoir, and cooler; platform gates, anchor points, and controls.
Inspection before operation
Walk the apparatus: hydraulic oil level and leaks, wire rope for broken wires, kinks, or corrosion; pad wear; turntable bolts; waterway leaks; rungs and rails; stabilizer pins and pads; interlock and emergency-system function; placards; lights; tires. Any defect goes on the report before the apparatus moves.
Worked example. During the walk-around you find two broken wires side by side on the boom extension rope, plus a kink near the sheave. The rope is not serviceable: manufacturer wire-rope condemnation criteria and NFPA 1911 inspection practice call for removal from service, not “watch it for a shift.” The aerial is tagged out and the shop is notified, because a rope failure under load can drop the boom.
Traps. Treating any aerial with a pump as a quint; believing a visual inspection replaces periodic load testing; checking hydraulic oil with the boom raised (the level reads wrong); ignoring the emergency lowering system until you need it.