A tower crane is positioned such that its maximum rated capacity at a 30-metre (98-foot) radius is 5,000 kg (11,000 lbs). The current lift requires hoisting a pre-fabricated concrete panel weighing 4,200 kg (9,260 lbs) with a rigging assembly that weighs 350 kg (770 lbs). The required lift radius is 32 metres (105 feet). According to the load chart, at 32 metres (105 feet), the crane's maximum capacity is 4,500 kg (9,920 lbs). Can this lift proceed safely?

Question: A tower crane is positioned such that its maximum rated capacity at a 30-metre (98-foot) radius is 5,000 kg (11,000 lbs). The current lift requires hoisting a pre-fabricated concrete panel weighing 4,200 kg (9,260 lbs) with a rigging assembly that weighs 350 kg (770 lbs). The required lift radius is 32 metres (105 feet). According to the load chart, at 32 metres (105 feet), the crane's maximum capacity is 4,500 kg (9,920 lbs). Can this lift proceed safely?

Answer options:

• Yes, because the panel weight is less than the capacity at 30 metres. ✅ No, because the total lifted weight exceeds the capacity at the required radius.
• Yes, as long as the operator performs the lift slowly and carefully.
• No, but it could proceed if additional counterweights were added to the crane.

Correct answer: No, because the total lifted weight exceeds the capacity at the required radius.

Explanation: The total weight to be lifted, including the load and rigging, is 4,200 kg + 350 kg = 4,550 kg (9,920 lbs + 770 lbs = 10,690 lbs). At the required operating radius of 32 metres (105 feet), the crane's maximum rated capacity is 4,500 kg (9,920 lbs). Since the total lifted weight (4,550 kg) exceeds the crane's capacity at that radius (4,500 kg), the lift cannot proceed safely.