Small Aircraft
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 50; Flight Crew Total 4000; Flight Crew Type 500
Communication Breakdown
Conflict NMAC
General None Reported / Taken
Human Factors
We were doing pattern operations at Leesburg with a student. We were on the left downwind for Runway 17 at Leesburg. It was busy with at least one other in the pattern and several aircraft waiting for takeoff and I believe two aircraft approaching for landing. About midfield I noticed on my portable ADS-B indicating an aircraft adjacent to us. Looking to the left there was an aircraft passing on our left just below and to our left. We were completely surprised by this. As far as I could tell the aircraft was doing a left downwind departure to the north which was unusual at Leesburg. I do not know if the aircraft had visual contact with us. Doubtful as we were in his blindspot. Most departures from 17 do a right hand departure to exit the pattern expeditiously. I heard nothing from the Tower that approved this and there was no warning from the Tower of the oncoming traffic. I confirmed with a fellow CFI in the pattern that I hadn't missed a call. The other CFI was about a half mile on downwind and witnessed the near collision. I called the Tower about the traffic and was just told he was departing to the North.
GA pilot reported an NMAC during initial approach to JYO airport.