StacksVerified U.S. regulatory reference

30 CFR §250.404

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
You must have a crown block safety device that prevents the traveling block from striking the crown block. You must check the device for proper operation at least once per week and after each drill-line slipping operation and record the results of this operational check in the driller's report.