Maintenance Flashcards
7 cards from real UAS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Maintenance flashcards as text
What does IMU (Inertial Measurement Unit) calibration correct for in a UAS?
Answer: Sensor drift caused by temperature changes and vibration
IMU calibration corrects for sensor drift caused by temperature changes and vibration, ensuring accurate attitude estimation for stable flight.
A UAS shows abnormal vibration during hover. What is the most likely first cause to investigate?
Answer: Unbalanced or damaged propellers
Unbalanced or damaged propellers are the most common cause of abnormal vibration and should be inspected first before investigating other systems.
When inspecting the airframe of a carbon fiber UAS after a minor collision, what specific defect should the operator look for?
Answer: Delamination, cracks, or white stress marks in the carbon fiber
Carbon fiber can delaminate or develop stress cracks internally that appear as white marks, compromising structural strength even when surface damage looks minor.
What is the recommended action when a motor shows signs of overheating after a flight?
Answer: Allow it to cool naturally, then inspect windings for burns or damage
After allowing the motor to cool naturally, inspect the windings for burns or damage to determine if it is still airworthy before the next flight.
How often should gimbal motors and bearings typically be inspected on a commercially operated UAS?
Answer: Per the manufacturer's maintenance schedule or after heavy use
Gimbal motors and bearings should be inspected per the manufacturer's maintenance schedule or following periods of heavy use to prevent stabilization failures.
What is the purpose of a compass calibration on a UAS?
Answer: To map local magnetic field variations so heading data is accurate
Compass calibration maps local magnetic field variations so the UAS can determine accurate heading, which is critical for stable GPS-assisted flight.
What maintenance step is critical after replacing a propeller on a UAS?
Answer: Verifying correct rotation direction and secure fastener torque
After propeller replacement, verifying correct rotation direction and ensuring fasteners are torqued to specification prevents propeller separation or improper thrust.