from the ground. The crane’s working area changes immediately, with the boom moving into an entirely differ- ent sector of the job site. Without clear communication, a crew member who was previously in a safe location can suddenly find themselves standing in an active drop zone. “You just changed the drop zone,” Pip- itone told his operator after the transi- tion happened without warning on one of their early jobs. “And we had a con- versation about that, and he never did it twice.” The corrective principle is straight- forward: whenever the crane changes function or the boom moves into a new sector, the operator must communicate the transition to the crew before it hap- pens. Final accountability, if material is suspended over a person, rests with the operator. “If you pick up something and suspend it over people and it falls — it’s your fault,” Pipitone said. Pipitone highlighted a related hazard: the sheer visual magnetism of the crane creates distraction risk for crew members running other equipment. “I was mesmerized watching the crane picks,” he shared, describing a mo- ment when his attention drifted from
Even with advanced equipment, skilled climbers remain essential on many jobs.
not wearing it out, and we’re not taking the potential of something catastrophic happening.” When Palfinger technicians performed a data download on their older ma- chine, the history confirmed the disci- pline — nearly all picks ran at sixty-five percent of capacity or below. Pipitone was equally direct on match- ing the machine to the pick. “You want to take a bite of something that is yours,” he said. Start with smaller sections when estab- lishing a new position, increase piece size as geometry and confidence con- firm it is safe to do so, and never cross into side loading. “[Knuckle-boom operation] is some- thing that you practice and you get in tune with — knowing where the dy- namic energy is going to go, knowing not to take too big a piece,” Pipitone added. “The species of the tree matters tremendously. Different densities of the wood you’re going to be handling. That’s very important.” THE DROP ZONE IS WHEREVER THE BOOM IS One of the most important operation- al concepts Pipitone raised involves something that traditional tree care
handles differently: the drop zone. In conventional work, the drop zone is roughly the drip line of the tree — the area beneath the canopy where materi- al is likely to fall. With a knuckle-boom crane, the drop zone moves with the boom, and it changes every time the operator changes function. “With the knuckle boom, the drop zone is wherever that boom is,” Pipitone said. “Or if he’s holding something, it’s potentially a drop zone. So, the entire radius is potentially a drop zone.” One scenario highlights the risk partic- ularly well. An operator completes the canopy work and shifts to loading logs
A successful crane operation depends on coordination between equipment, crew, and work zone layout.
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