What is one critical condition for crane operation safety?

Ensuring stable ground conditions is crucial for crane operation safety because the stability of the crane directly affects its ability to lift and maneuver loads safely. On unstable ground, a crane can tip over or become misaligned, which can lead to accidents that jeopardize the safety of workers and surrounding property.

Stable ground allows for the distribution of weight and minimizes the risk of sinking or shifting during operation. This requires proper assessment of the ground prior to crane setup, including evaluating soil composition, moisture levels, and any underlying structures that might impact stability.

In contrast, the other options involve unsafe practices. Working without a backup compromises operational safety, low visibility can significantly increase the risk of accidents due to the operator's inability to see loads and surrounding areas clearly, and ignoring minor equipment issues can lead to major failures during operation. Each of these practices undermines safety protocols, while ensuring stable ground conditions is a fundamental aspect of safe crane operation.