FAA 107 Aircraft Maintenance & Pre-flight Inspection 4

Question 1

What is the primary reason to inspect the sUAS airframe for loose screws and fasteners before each flight?

Accepted Answer

Vibration from motors can loosen fasteners over time, risking structural failure mid-flight

Answer

Motor vibration gradually loosens screws, and if critical fasteners fail in flight, components can separate causing a crash or endangering people below.

Question 2

A remote pilot is conducting a pre-flight check and finds the GPS module reports fewer than the minimum recommended satellites. What is the correct action?

Accepted Answer

Wait for adequate satellite acquisition before beginning flight operations

Answer

Insufficient GPS satellite lock compromises position hold accuracy and may disable GPS-dependent safety features like RTH and geofencing.

Question 3

During a pre-flight check, how should a remote pilot verify that the failsafe behavior is correctly configured?

Accepted Answer

Simulate a signal loss in a safe area and confirm the drone behaves as expected

Answer

Actively simulating signal loss in a controlled environment is the only reliable way to confirm that the failsafe triggers the intended behavior such as RTH or land.

Question 4

Which of the following is an acceptable storage condition for LiPo batteries between flights?

Accepted Answer

At storage voltage (approximately 3.8V per cell) in a fire-resistant LiPo bag

Answer

LiPo batteries stored at approximately 3.8V per cell (storage voltage) in a LiPo-safe bag experience minimal degradation and present the lowest fire risk.

Question 5

A sUAS remote pilot observes that one motor sounds rougher than the others during a ground spin test. What does this most likely indicate?

Accepted Answer

Possible bearing wear or debris inside the motor that requires inspection

Answer

A rough or grinding sound from a motor during a spin test suggests worn bearings, contamination, or internal damage that could lead to motor failure in flight.

FAA Practice Test

FAA Practice Test

FAA 107 Aircraft Maintenance & Pre-flight Inspection 4