Operates equipment described to lift, tow, position, or otherwise move aircraft; major master gauges, dies, assembly jigs, patterns, mock-ups, and functional test panels; aircraft engines, propellers, empennages, and fuselage sections, including unloading vendor-fabricated assemblies and raw materials from railway cars and trucks; stationary air compressors, welding generator units, portable tool cribs, and small out-buildings. Transports loads described below characterized by factors such as dimensional problems of extreme length, height, or width; high center of gravity and relative instability; extreme weight; extremely large surface areas or volumes and relatively unsubstantial structure requiring continuous care and caution to maintain balance and clearances or coordinated efforts of two or more drivers and pieces of equipment.