30 CFR §250.611
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
You must equip all units being used for well-workover operations that have both a traveling block and a crown block with a safety device that is designed to prevent the traveling block from striking the crown block. You must check the device for proper operation weekly and after each drill-line slipping operation. You must enter the results of the operational check in the operations log.