UAS Maintenance 3

Question 1

What does IMU (Inertial Measurement Unit) calibration correct for in a UAS?

Accepted Answer

Sensor drift caused by temperature changes and vibration

Answer

IMU calibration corrects for sensor drift caused by temperature changes and vibration, ensuring accurate attitude estimation for stable flight.

Question 2

A UAS shows abnormal vibration during hover. What is the most likely first cause to investigate?

Accepted Answer

Unbalanced or damaged propellers

Answer

Unbalanced or damaged propellers are the most common cause of abnormal vibration and should be inspected first before investigating other systems.

Question 3

When inspecting the airframe of a carbon fiber UAS after a minor collision, what specific defect should the operator look for?

Accepted Answer

Delamination, cracks, or white stress marks in the carbon fiber

Answer

Carbon fiber can delaminate or develop stress cracks internally that appear as white marks, compromising structural strength even when surface damage looks minor.

Question 4

What is the recommended action when a motor shows signs of overheating after a flight?

Accepted Answer

Allow it to cool naturally, then inspect windings for burns or damage

Answer

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.

Question 5

How often should gimbal motors and bearings typically be inspected on a commercially operated UAS?

Accepted Answer

Per the manufacturer's maintenance schedule or after heavy use

Answer

Gimbal motors and bearings should be inspected per the manufacturer's maintenance schedule or following periods of heavy use to prevent stabilization failures.

(UAS) Unmanned Aircraft Systems Certified Practice Test

(UAS) Unmanned Aircraft Systems Certified Practice Test

UAS Maintenance 3