Aerial Device Operation and Emergency Procedures
Aerial Device Operation and Emergency Procedures
This domain covers running the device and recovering from its failures. The exam expects interlocks, load limits, and a defined response to hydraulic loss and electrical contact.
Core rules
- Interlocks exist for a reason: parking brake set, outriggers deployed, PTO engaged, aerial unlocked from its bed. If an interlock will not release, find out why instead of forcing the control.
- Controls are hold-to-run. Releasing the handle stops motion; that is a safety feature, not a malfunction.
- Know the tip load rating from the data plate and count everything on the ladder: personnel, tools, the ladder pipe, and the water in it. Ladder pipe flow and elevation limits come from the manufacturer.
- Clear the swing area before rotating. Anyone under the device is in the drop zone.
- Emergency lowering uses the auxiliary system - a manual pump or emergency valve, placarded at the turntable. Locate it during the walk-around, not during the emergency.
- If the device contacts energized lines, stay on the apparatus, warn everyone away, and have the utility de-energize the line. Never complete a path to ground.
Worked example
Hydraulic pressure is lost with a member at the tip of an extended ladder. Reasoning: the boom will not hold position indefinitely and the member cannot climb down safely. Stop all other operations, clear the area below, announce the plan to the member over the intercom, then use the placarded emergency lowering system to bring the tip down slowly under control. Do not attempt to hand-crank faster than the manufacturer's procedure allows, and do not let anyone steady the boom by hand.
Traps that cost marks
Overloading the tip by ignoring the ladder pipe water; rotating with a firefighter standing at the turntable edge; touching the outrigger to a fence that is energized; guessing at the emergency valve location.