What 29 CFR 1904.40 requires (plain English)
29 CFR 1904.40 is the government-access rule for injury records. When an authorized government representative asks for the records you keep under Part 1904, you must provide copies within four business hours (1904.40(a)). The authorized representatives are a representative of the Secretary of Labor conducting an inspection or investigation, a representative of the Secretary of Health and Human Services, including NIOSH, conducting an investigation under section 20(b) of the Act, and a representative of a State agency administering an approved State Plan ((b)(1)).
The rule settles one practical question itself. If the records are kept at a location in a different time zone, you may use the business hours of the establishment where the records are located when calculating the deadline ((b)(2)). A vendor or central office does not stretch the clock: 1904.30(b)(2) allows central records only if they can be produced within the time frames of 1904.35 and 1904.40.
1904.40 is separate from employee access under 1904.35, which gives employees, former employees and their representatives a copy of the 300 Log by the end of the next business day. In fiscal year 2025, federal OSHA cited construction employers 57 times under 1904.40 (HazComFast count from Labor Department enforcement data).