Large UAS; Fixed Wing
Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 380; Flight Crew Total 1630; Flight Crew Type 1060
Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Flight Crew Took Evasive Action
Chart Or Publication; Human Factors; Airport
On Date at XA15 local Aircraft X had a near miss incident. The other Aircraft Y looked to be a Helicopter. Aircraft X was conducting flight tests in the local area and training in the traffic pattern. They were using Runway XX and using a right traffic pattern. While Aircraft X was descending into the airport the [Visual Observer] noticed the helicopter was headed to ZZZ airport on a NE heading about 200-300 feet AGL. We notified Aircraft X that there was traffic converging in their flight path. At this point Aircraft X completed their landing and was on the upwind Runway XX. At this point Aircraft Y was at the departure end of the runway at 200 feet AGL. We told Aircraft X urgently to turn left and they were about cross paths with Aircraft Y. This wasn't possible because they were too low to the ground. They ended up leveling to pass under the helicopter. Aircraft X and Aircraft Y came within about 20-50 feet of each other. Talking to my other pilot we believe Aircraft Y failed to read the NOTAMS around the local area saying there is UAV activity in the area. Aircraft Y should have never been that low to the ground near the departure end of the runway. Aircraft Y clearly did not see Aircraft X as he did nothing to attempt to climb; descend; or turn.
[Report narrative contained no additional information.]
Visual Observer witnessed a near miss between a UAS and a helicopter.