What functions will be disabled if the operator two-blocks the crane while hoisting personnel?

When a crane operator two-blocks the crane while hoisting personnel, certain safety functions are indeed disabled to prevent further operation and mitigate the risk of accidents. The correct answer involves the disabling of the hoisting up function, extending out, and lowering the boom.

Two-blocking occurs when the hook and the block come into contact with each other during the lifting operation. This situation is dangerous as it can cause significant damage to the crane and poses serious safety risks to personnel. To protect against such risks, modern cranes are designed with safety systems that disable certain functions when two-blocking is detected.

Specifically, the hoist up function is disabled to prevent any further lifting that could exacerbate the risk of damage or create dangerous situations. Additionally, extending out and lowering the boom are also disabled, ensuring that the crane stays in a safer position and does not inadvertently create a hazard by moving the boom or the load.

Understanding the implications of two-blocking and the associated disablement of safety functions can help operators maintain safe practices and respond appropriately if such a situation occurs. The prevention of hoisting up, extending out, and lowering the boom emphasizes the importance of adhering to proper operational protocols and safety measures in crane operations.