Backward stability of a crane is tested in which configuration?

Backward stability of a crane focuses on the ability of the crane to remain balanced and prevent tipping over when the boom is configured in a way that could lead to instability. Testing backward stability is crucial to ensure safe operations, especially when the crane is handling loads at various boom angles.

The correct configuration for assessing backward stability is when the basic boom is at its maximum angle with no load. In this setup, the angle of the boom creates conditions that could challenge the stability of the crane. Conducting a stability test in this manner allows operators and safety professionals to evaluate the crane's structural integrity and balance without the added variable of a load, which could complicate analysis.

When the boom is at its maximum angle without a load, it provides a clear understanding of the crane's center of gravity and how it shifts during operation. This is essential for operators to learn how the crane will behave under various working conditions.