What risk arises if a bearing surface sinks due to improper support?

• A. Crane lifts away from level
• B. Crane becomes more stable
• C. Engine stalls
• D. Outriggers retract

Answer: (A)

A crane relies on a level, solidly supported base to keep its center of gravity aligned with the crane's structure. When a bearing surface sinks because the support is inadequate, that base becomes uneven. The crane tilts toward the sunken side, so the body rises away from level. This loss of level condition is why the crane becomes unstable and carries a high risk of tipping under load or even with little load. To avoid this, always ensure outriggers are on firm, level ground and use appropriate pads or cribbing and relevel before lifting. The other outcomes don’t fit the situation: the crane wouldn’t become more stable; engine stalling isn’t a direct consequence of a sinking bearing surface; and outriggers retracting isn’t an automatic result of the surface sinking. The real risk is lifting away from level.