2025-04 · NASA ASRS report 2233495
C172 Instructor and two Ag aircraft pilots reported an NMAC between each other at a non-towered airport. C712 Instructor also reported a runway incursion between conflicting traffic landing behind their company traffic on the same runway.
On Day 0 at approximately XA:00; two Air Tractors (Aircraft Y; Aircraft Z) were observed making erratic traffic pattern entries; not communicating; and possibly breaking right or way rules prescribed under FAR 91.115. I observed Aircraft Z after departing; enter a left downwind for Runway XX under company traffic; Aircraft A. Aircraft A had to deviate off descent path as Aircraft Z under them and entered a left base and then departed the area from that left base for Runway XX. At the same time; Aircraft Y was entering from the north on a dog leg left base for Runway XX at the same altitude. This further constricted Aircraft A's conflict resolution options. Aircraft A was able to continue to land and I observed Aircraft Y less than a mile behind and not communicating - they continued to land on Runway XX.My student and I continued our pattern for Runway XX. While I was established on final; another company Air Tractor (unsure of tail number) proceeded to line up and wait on Runway XX and departed - radio call was made. I continued to land - touch and go. At this time; Aircraft Y was holding short of Runway XX at 1. Immediately after departure; Aircraft Y proceeded to take Runway XX at 1 and departed behind me - no radio call made. I noticed on Multi-function Flight Display (MFD) traffic screen a target -02 and appeared to be below me and climbing. I attempted to contact Aircraft Y to ask for intentions twice - he replied to the second attempt saying 'calm down; I'm trying to work'. Aircraft Y then conducted a left crosswind 300 ft below me to exit the area to the north - no radio call.
During a Part 137 Ag operation we communicated our intentions and they were Okay with it. The problems were on the approaches; trying to get back in the pattern. To many student pilots in the pattern to where spacing became a problem. The student pilots stayed close traffic; not giving any way to the Airtractors. The plane I flew never had any runway incursions and never came close to any other airplanes. We've accommodated them by doing orbits; if needed; to try and help with the spacing. We also applied and got approved for a business license to operate out of there and pay daily fees for the Agricultural work that we have a deadline for to complete.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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