What 29 CFR 1926.1417 requires (plain English)
29 CFR 1926.1417 governs the operation of cranes and derricks covered by Subpart CC. Its foundational requirement is that the employer comply with all manufacturer procedures applicable to the equipment's operational functions, including its use with attachments: the crane must be run the way the manufacturer designed and rated it.
From that flow the specific operating rules: loads must stay within the rated capacity shown on the crane's load chart for the actual boom length, radius, and configuration; the operator must not engage in activities that divert attention while operating; and, critically, the operator must not leave the controls while a load is suspended. The standard also addresses procedures where manufacturer procedures are unavailable (using a qualified person), tag-out of controls, and safe practices around the equipment.
1926.1417 also requires that operations stop under danger conditions, if the operator or another responsible person determines there is a safety problem, such as signs of instability, structural concerns, or a failing component, the lift must be halted until the problem is resolved. Together with the operational aids (1926.1416) and rated-capacity requirements, this section is the core of safe crane operation.