The crane must be structurally inspected annually by a professional engineer or a competent worker designated by a professional engineer using nondestructive testing methods covered by CGSB specifications.The crane must have fail safe mechanisms to prevent free fall of the boom or platform and to prevent two-blocking.The crane must not hoist material while the platform is being used to lift a worker.A revised load rating chart prepared by a professional engineer must be affixed to the crane. The crane must not be loaded in excess of 25% of its maximum rated load.Similarly, the crane must satisfy various criteria as well: The rated load capacity must be marked on it.