A crane's load chart specifies a reduced capacity if the crane is out of level by more than 0.5 degrees. If the operator's level indicator shows a deviation where the outrigger on the right side is 150 mm lower than the one on the left over a 12-meter outrigger span (centreline to centreline), is the crane operating within the 0.5-degree tolerance?

Question: A crane's load chart specifies a reduced capacity if the crane is out of level by more than 0.5 degrees. If the operator's level indicator shows a deviation where the outrigger on the right side is 150 mm lower than the one on the left over a 12-meter outrigger span (centreline to centreline), is the crane operating within the 0.5-degree tolerance?

Answer options: ✅ No, it exceeds the tolerance.

• Yes, it is within the tolerance.
• Only if the boom is fully retracted.
• Only if the load is less than half capacity.

Correct answer: No, it exceeds the tolerance.

Explanation: Angle (degrees) = atan(Opposite/Adjacent) * (180/π). Opposite = 0.15 m, Adjacent = 12 m. Angle = atan(0.15/12) * (180/π) = atan(0.0125) * 57.2958 ≈ 0.716 degrees. Since 0.716 degrees > 0.5 degrees, the crane is out of tolerance, requiring re-levelling before operation (CSA Z150 Annex B.5.1).