How often
BOP bridge crane trolley hoists, hydraulic winches and air tuggers: Category I daily, Category II monthly, annual OSHA inspection. Crane hooks and hoist chains: daily visual and a monthly certification record. Hoist upper limit switch: tried at the start of each operator's shift.
Source: Nordic PM Plan 9.0 Table 4 (note **); OSHA 29 CFR 1910.179(j)(2) and (n)(4)(i)