National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

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Study for the NCCCO Mobile Crane Test. Prepare with flashcards and multiple-choice questions, complete with hints and explanations for each. Ace your certification exam!

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When may blocking (cribbing) be placed under outrigger beams?

When beams cannot be extended all the way out
To increase capacity
To improve stability
Never

The correct answer is: Never

Blocking, or cribbing, should not be placed under outrigger beams during crane operations. The primary reason for this is that proper outrigger extension provides the necessary stability and capacity for the crane. When the outriggers are fully deployed, they are designed to distribute the load evenly across the surface, maintaining stability and preventing tipping. If blocking is used, it can create uneven pressure distribution and could compromise the stability of the crane, leading to potential hazards. The outriggers are engineered to operate effectively without additional support, and modifying their function by introducing blocking could introduce risks that are not accounted for in the crane's operational design and load charts. Using blocking may be seen as a quick fix to a problem, but it poses safety risks; thus, it is essential to rely on the full extension of the outrigger beams as intended by the manufacturer for safe crane operation.