21.   Airport workers found turbine blades and metal debris on the runway afterward, Federal Aviation Administration spokesman Jim Peters said.

22.   Airport workers found turbine blades and metal debris on the runway afterward.

23.   An unbalanced turbine blade can also cause such a failure, but that is usually detected during routine maintenance, Waldock said.

24.   However, no safety incidents have been caused by the potential problem with a part called a high-pressure turbine blade, a company spokesman said.

25.   If the turbine blades are moving, then the sisters need to buy less electricity from their utility in southwestern North Dakota.

26.   Many parts, like jet turbine blades and disks, must be replaced after a set amount of hours aloft because of the stress they undergo.

27.   Overhauled turbine blades have been damaged or broken in four incidents in six months.

28.   She tried to tackle other issues during a recent visit to the Ellison Surface Technologies factory in North Clarendon, where turbine blades for aircraft engines are coated.

29.   The problem appears to be that turbine blades are a fraction too big and cause excessive wear.

30.   The problem occurred when a moving turbine blade struck a stationary blade, breaking part of the engine, Middleton said.