31. Check the jackscrew and nut for wear; 32. Check the general condition of the jackscrew assembly 33. The order followed by a day a recommendation from Boeing that carriers inspect the jackscrews . 34. American inspects the jackscrew and related parts about every 100 days, the company said. 35. The federal agency also gave airlines 30 days to measure wear in the jackscrew assembly. 36. The jackscrews were replaced in a number of planes after the inspections, Dorr said. 37. Four jackscrews replaced, others being evaluated. 38. _Continental Airlines, 69 planes : One plane had grit in the jackscrew grease. 39. And American recorded the wear rates of its jackscrews , something that was not required. 40. A plugged grease fitting may have prevented grease from getting on the jackscrew during lubrication.
