Contractor personnel shall analyze and evaluate structural damage to metal systems and items; develop patterns using a combination of parallel and radial line development; fabricate, install, and repair a variety of items and systems made from a wide variety of metals, e.g., stainless steel, copper sheet, magnesium, honeycomb, alloys, aluminum; replace sections and patch old systems; cut, bend, shape, and form metals for items that have numerous irregular angles, planes, and curves with varying pitch and circumference; use a variety of assembly joints, complex fastening systems, riveted or welded joints, drill or punch holes; and assemble or repair items by seaming, soldering, bolting, screwing, riveting, tacking, and spot welding. Contractor personnel shall perform a full range of aircraft sheet metal duties including, but not limited to, disassemble, modify, repair, and reassemble complex aircraft metal items and systems, e.g., bulkheads, airframes, spars, air scoops, wings, flaps, pylons, sponsons, fuselages, skins, ribs, gussets and fuel tanks.