UAS maintenance is easier—and safer—when you understand how the whole system fits together. In this micro-learning course (exactly 10 short modules), you’ll learn the purpose of major UAS components, what commonly goes wrong, and what to check during routine inspection and preventive maintenance. You’ll start with UAS system architecture (air vehicle, payload, ground control, and data links) to build a clear mental map for troubleshooting. Then you’ll move through the airframe and mechanical hardware (structures, materials, fasteners, vibration effects, landing gear, arms/booms, hinges, and gimbals). Next, you’ll focus on propulsion and power (motors, propellers, ESCs, batteries, power distribution, and wiring) and how wear, heat, and poor connections show up as real-world symptoms. Finally, you’ll cover the “brains and senses” of the aircraft—flight controller hardware/firmware and core sensors—plus essential calibration and pre-flight functional checks. The course wraps with tools, ESD-safe work habits, inspection schedules, and documentation practices so you can return an aircraft to service confidently and consistently. Designed for beginner-level adult learners, each module is short, practical, and focused on what technicians actually look for on the bench and in the field.