Which of the following is a key factor in ensuring the safe operation of a crane?

Regularly inspecting crane parts and rigging is essential for ensuring the safe operation of a crane because it helps identify any wear and tear, potential mechanical failures, or safety hazards before they lead to accidents. Inspections allow operators to verify that all components, such as cables, hooks, and other rigging, are in good condition and functioning correctly. This proactive approach to maintenance reduces the risk of malfunction during operation, thereby promoting the safety of both operators and those on the ground.

In addition, thorough inspections can also include checks for environmental factors that could affect crane operation, ensuring that the crane remains stable and operational under various conditions. Such diligence is critical in adhering to safety regulations and best practices in the field.

The other choices illustrate practices that could lead to unsafe conditions. For example, ignoring weather conditions can put both the crane and crew at risk, as adverse weather can greatly affect crane stability. Similarly, maximizing weight limits on lifts can exceed the crane's safe operating capacity, leading to catastrophic failures. Finally, operating without a signal person can lead to miscommunication and increase the likelihood of accidents, as it becomes challenging for the operator to have a clear understanding of the surrounding environment and load movements.