Ability to communicate effectively both orally and in writing; to supervise and train skilled and unskilled employees in assigned trade(s) work; to plan and organize maintenance work; to determine sufficiency of cost estimates prepared by others; to prepare specifications for tools, equipment, materials, and supplies; to prepare summaries and reports; to work in, on, around, over and under fixed equipment and machinery; to work from ladders and scaffolding; to manipulate heavy equipment, tools, and supplies and/or exert force up to 70 lbs. to concurrently manipulate multiple controls on machinery and equipment; to work in hazardous or irritating environments, confined spaces, and adverse weather or temperature conditions; to wear and work in personal protective equipment. Thorough knowledge of and skill in the practical application of electronics, hydraulics, and mechanics as used in maintenance work; of basic mathematics including area, volume, weights and the practical application of fractions, percentages, ratios and proportions; of the principles of supervision in the maintenance trades.