FAA 107 Aircraft Maintenance & Pre-flight Inspection 2 — Questions and Answers
Question 1: During a pre-flight inspection, you notice a small crack in one of the propeller blades. What should you do?
- Fly carefully and avoid aggressive maneuvers
- Replace the propeller before flying (Correct answer)
- Apply tape to the crack as a temporary fix
- Only fly in calm wind conditions to reduce stress
Correct answer: Replace the propeller before flying
A cracked propeller is a structural defect that can cause catastrophic failure during flight, so it must be replaced before any flight operation.
Question 2: Which of the following best describes the purpose of checking motor temperatures after a test hover during pre-flight?
- To verify the FC firmware is current
- To detect abnormal heat that may indicate motor wear or electrical issues (Correct answer)
- To calibrate the ESC throttle range
- To ensure the gimbal is properly balanced
Correct answer: To detect abnormal heat that may indicate motor wear or electrical issues
Abnormally hot motors after a short hover can indicate bearing wear, winding shorts, or excessive friction that could lead to motor failure in flight.
Question 3: What is the recommended action when a sUAS has experienced a hard landing but shows no visible damage?
- Resume operations since no damage is visible
- Perform a thorough inspection of frame, props, and motors before flying again (Correct answer)
- Fly for 5 minutes at low altitude to test performance
- Only inspect if the landing was from above 10 feet
Correct answer: Perform a thorough inspection of frame, props, and motors before flying again
Hard landings can cause hidden micro-cracks in the frame or internal motor damage that isn't visible but can cause failures during subsequent flights.
Question 4: When should a remote pilot check that the compass is properly calibrated on a sUAS?
- Only when the manufacturer recommends it annually
- After any significant firmware update, change of operating location, or compass warning (Correct answer)
- Only when flying over water
- Before every flight regardless of any indicators
Correct answer: After any significant firmware update, change of operating location, or compass warning
Compass recalibration is needed after firmware updates, relocating to a new area far from the last calibration site, or when the flight controller shows a compass error.
Question 5: A remote pilot notices that one landing gear leg is bent after a previous flight. What is the correct course of action?
- Fly as long as the drone can still land upright
- Repair or replace the landing gear before the next flight (Correct answer)
- Manually hold the drone for launch and recovery
- Only avoid rough terrain landings
Correct answer: Repair or replace the landing gear before the next flight
Damaged landing gear can affect stability during takeoff and landing, and continued use can cause further damage to the airframe or payload.
Question 6: What does a blinking red LED indicator on a sUAS battery typically signify?
- The battery is fully charged and ready
- A low cell voltage or battery fault requiring attention before flight (Correct answer)
- The battery is in storage mode
- Normal status during initial power-on
Correct answer: A low cell voltage or battery fault requiring attention before flight
A red blinking LED on most sUAS batteries indicates low charge, cell imbalance, or a fault condition that must be resolved before the battery is safe to fly.
Question 7: Which component should be inspected to ensure the video feed and control link will not interfere with each other during operations?
- The propeller pitch angle
- The antenna placement and orientation on both the aircraft and the controller (Correct answer)
- The motor KV rating
- The ESC calibration settings
Correct answer: The antenna placement and orientation on both the aircraft and the controller
Antennas must be properly positioned and oriented to minimize interference between the video downlink and the control uplink frequencies.
FAA 107 Aircraft Maintenance & Pre-flight Inspection 2
During a pre-flight inspection, you notice a small crack in one of the propeller blades.
What should you do?