# HANDLING OF MATERIALS
> MSHA accident `220260990023` · 04/01/2026 · UNACEM North America
## Details
- **Degree of injury:** NO DYS AWY FRM WRK,NO RSTR ACT
- **Classification:** HANDLING OF MATERIALS
- **Accident type:** Struck by flying object
- **Occupation:** Electrician, Lineman
- **Activity:** Machine maintenance
- **Injury source:** METAL,NEC(PIPE,WIRE,NAIL)
- **Nature of injury:** FRACTURE,CHIP
- **Body part:** FINGER(S)/THUMB
- **Days lost:** 0
- **Mine experience:** 0.69 years
## Operator
- **Controller:** UNACEM Corp S A A
- **Operator:** UNACEM North America
- **Mine:** [0203243](https://api.ai-analytics.org/mine/0203243)
## Narrative

The employee was attempting to calibrate the TA duct damper with a manual handle. While operating the gate with the LCB, the damper was moved to a fully open position. The employee applied firm pressure to move the manual operation handle, the counterweight pulled down, and the handle began spinning rapidly in an uncontrollable manner with heavy force. 

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*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · AI Analytics · CC0 1.0*