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NASA Aviation Safety Reporting System (ASRS) - UAS Safety in Sight

December 2025

remote controller and drones

Detecting DronesHear, See, and Avoid

One of the goals of UAS Safety Reporting is to share lessons learned with the UAS community. When reporters describe their insights and reflect on their experiences, they contribute to UAS safety by offering valuable tips that others in the UAS community may be able to apply to their operations.


In this issue, we offer a safety report from a recreational drone pilot who experienced a Near Midair Collision (NMAC) with a delivery drone. Recognizing the delivery drone’s proximity by sound before sight, the reporter took measures to pre-emptively avoid a collision, but questioned the delivery drone’s ability to detect and avoid other craft. As the drone industry evolves along with Detect and Avoid (DAA) systems, applying hear, see, and avoid techniques such as this reporter demonstrated, continues to be key to collision avoidance. 

ACN: 22440132040565 2040565

Took my drone on a short flight to make sure the battery didn't go bad from not being used. Ascended to approximately 390 ft AGL and then started descending. I heard a sound I recognized as a delivery drone approaching and immediately arrested the descent while I looked for it. Within 10 seconds total it was passing directly overhead at maybe 200 ft AGL.


Not knowing where it went to as I lost visual during its descent a couple streets north, I decided to hold position and wait for it to return. In less than a minute, it flew underneath my drone which I captured on the camera.


The drone was flying much lower than I had seen them in the past. Because of this, I had almost no opportunity to make visual contact and avoid its flight path. I believe that if I had not stopped my descent upon hearing the drone, my drone and the delivery drone would have been at nearly the same altitude and location. I understand the delivery drones have advanced sensors and are able to avoid manned aircraft. Would it have avoided my tiny drone?


To prevent becoming the first person to take out a delivery drone in flight, I will be refraining from any more flights except for low altitude and more rural locations. 

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Read more!

Previous issues of UAS Safety In Sight are available online at ASRS: 

ASRS Database Online
To view these reports and other UAS reports, visit the ASRS Database Online: 
Would you like to learn more about the NASA Aviation Safety Reporting System?

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Aviation Safety Reporting System
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