serviceability control
91clear — i. In air traffic control, it means permitted to take off or land, cleared to carry out other maneuvers, or cleared to proceed under specified conditions. The activity the pilot is cleared to perform is either suffixed to the word clear, as in… …
92use — [n] application; employment account, adoption, advantage, appliance, applicability, appropriateness, avail, benefit, call, capitalization, cause, convenience, custom, end, exercise, exercising, exertion, fitness, good, habit, handling, help,… …
