warning and take appropriate action, maintain equilibrium to prevent falling when moving, walking, standing, kneeling or crouching- particularly on narrow, uneven, irregular, slippery surfaces, going up and down ladders, stairs, scaffolding, ramps, poles or other objects using hands, arms, feet or legs. Visually examine materials, structures or components using tools and visual aids such as endoscopes, closed circuit television systems, and fiber optics for signs of corrosion, metal fatigue, cracks, or other.