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
Which log data should an operator review to diagnose a sudden loss of altitude during a previous flight?
Answer: Throttle, motor RPM, and barometer logs
Reviewing throttle commands, motor RPM, and barometer logs together reveals whether the altitude loss was caused by power, motor, or sensor issues.
What condition indicates that a UAS airframe arm needs replacement rather than repair?
Answer: A crack propagating through the full cross-section of the arm
A crack propagating through the full cross-section means the arm has lost structural integrity and poses a collapse risk, requiring full replacement.
Why is it important to check for water or moisture inside the UAS after flying in high-humidity conditions?
Answer: Moisture causes corrosion on connectors and can short electronic components
Moisture causes corrosion on electrical connectors and can create short circuits that damage electronic components or cause in-flight failures.
What is the correct method to clean UAS camera lenses in the field?
Answer: Blow with compressed air then wipe with a microfiber lens cloth
Blowing with compressed air first removes loose particles that could scratch the lens, then a microfiber cloth safely removes remaining smudges.
When conducting a pre-flight control surface check on a fixed-wing UAS, what is the operator verifying?
Answer: That control surfaces respond correctly in direction and range of motion
Pre-flight control surface checks verify that each surface responds correctly to control inputs in the right direction and through the full expected range of motion.
What is a key indicator that a UAS motor bearing is failing and needs replacement?
Answer: The motor runs hotter than normal with a grinding or rough feel when spun by hand
A failing motor bearing produces a grinding or rough sensation when the motor is spun by hand and causes excess heat buildup during operation.
What does a torque test on propeller fasteners verify?
Answer: That fasteners are tightened to the manufacturer's specified torque value
A torque test verifies fasteners are at the manufacturer's specified torque value — under-torque allows loosening in flight while over-torque can crack the hub or strip threads.