Small unmanned aircraft components, battery and motor basics, and preflight inspection and maintenance concepts tested on the Part 107 exam.
30 cards · basic cards · AI-written, checked twice. Edit anything.
- What does KV mean when describing a brushless drone motor?
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Rotational speed in RPM per volt of electrical potential applied to the motor.- What type of battery is most commonly used in small UAS?
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Lithium polymer (LiPo) battery, valued for high discharge rates and energy density.- What does the C-rating indicate on a drone battery?
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The maximum safe discharge rate as a multiple of the battery's capacity; for example, a 50C battery can discharge at 50 times its capacity in amps.- What is an ESC in a small drone?
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Electronic Speed Controller; regulates electrical power from the battery to each individual motor.- What is the first step of any preflight inspection?
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Visually inspect the entire airframe, propellers, battery, and external components for damage or defects.- Why must you inspect propeller condition before every flight?
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Damaged or bent propellers cause vibration, reduce thrust, create instability, and increase accident risk.- What does a swollen or puffy LiPo battery indicate?
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Internal cell damage or gas buildup; the battery is unsafe to fly and must be safely discharged and disposed.- What are the main advantages of a brushless motor over a brushed motor?
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Brushless motors are more efficient, durable, cooler running, and require less maintenance than brushed designs.- How should you store a LiPo battery for extended periods when not flying?
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At storage voltage (about 3.85V per cell) in a cool, dry place, ideally in a fireproof container.- What is the primary function of a flight controller?
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Processes sensor data to automatically stabilize the aircraft and execute pilot commands.- What three things should you verify about your transmitter before flight?
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Battery is charged, transmitter is bound to the aircraft, and signal strength is adequate.- What does a gimbal stabilization system do on a drone camera?
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Uses motorized stabilization to dampen vibration and jitter, keeping the camera level during flight for smoother video.- What does mAh measure on a drone battery?
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Milliamp-hours; the total electrical charge the battery can store and deliver.- Name three common causes of motor failure in small UAS.
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Overheating from continuous high-power operation, water ingestion, and sand or debris in bearings.- Why must propeller rotation direction be verified during preflight?
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Incorrect rotation direction prevents proper thrust generation and lift, making stable flight impossible.
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