MACHINERY at Lafarge Aggregates Southeast
Operating crane (50 ton grove) rigged to 5700 lbs truss, moving 100' downhill in reverse, load in uphill position. Started to descend air pressure 120 lbs, crane in low gear reverse, traveled 30' to 40' down incline boom full retracted. Lost pressure due to mechanical failure. Brake max ruptured.
U.S. Mine Safety and Health Administration