A low mass hides a large wind-sensitive surface
A fictional tower crane is scheduled to move a broad panel whose mass is within the listed gross allowance after deductions. The load presents a large projected area, gusts are increasing and nearby work has narrowed the planned clear path. Someone proposes continuing because a different crane once operated at a remembered wind speed. The current machine’s out-of-service envelope has not been checked against a new scaffold. No crane is moved and no brake is released here. Identify why mass and an old wind number do not settle suitability, and explain which actual load, weather, path, machine and approved shutdown information needs competent review before proceeding.
1. Why is chart mass alone insufficient?
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Wind can add lateral force and control difficulty that depend on area, shape, gusts and actual configuration.
2. What makes the remembered shutdown unsafe as a universal rule?
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The actual machine, clear envelope and approved procedure govern; another crane’s wind or brake arrangement cannot be assumed applicable.