30 CFR § 56.14210 Movement of dippers, buckets, loading booms, or suspended loads.
(a) Dippers, buckets, loading booms, or suspended loads shall not be
swung over the operators' stations of self-propelled mobile equipment until
the equipment operator is out of the operator's station and in a safe
(b) This section does not apply when the equipment is specifically
designed to protect the equipment operator from falling objects.