FAA Part 107 Remote Pilot (UAG)OperationsMedium
A remote pilot is conducting a sUAS aerial survey near a location with a high concentration of radio transmitters and large metal structures. The sUAS begins to exhibit erratic behavior, including unexpected changes in direction and altitude, despite stable GPS reception. What is the most likely cause for this behavior?
- AMagnetic interference affecting the sUAS's compass.
- BLoss of GPS signal due to satellite obstruction.
- CPropeller imbalance causing excessive vibrations.
- DAerodynamic interference from the large metal structures.
Show answer & explanationAnswer & explanation
Correct answer: A. Magnetic interference affecting the sUAS's compass.
High concentrations of radio transmitters and large metal structures can create localized magnetic fields that interfere with the sUAS's internal compass or magnetometer, leading to erratic flight behavior even with stable GPS. The compass is crucial for accurate heading and stable flight.
Why the other options are wrong
- B. The scenario specifies 'stable GPS reception,' ruling out GPS signal loss.
- C. Propeller imbalance typically manifests as vibrations, noise, and potentially a 'wobble,' but less commonly as sudden, erratic directional changes unless severe.
- D. While large structures can cause turbulence, erratic changes in direction and altitude are more indicative of navigation system errors than purely aerodynamic effects.
Magnetic Interference
Disruption of a sUAS's internal compass (magnetometer) by external magnetic fields, leading to inaccurate heading information and erratic flight behavior.
- Caused by metal structures, power lines, radio transmitters.
- Affects compass/magnetometer, not GPS directly.
- Can lead to 'fly-aways' or unstable flight.
Memory trick: When the drone acts 'crazy,' check its 'brain' (sensors).