Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial
Flight Crew Last 90 Days 179; Flight Crew Total 721; Flight Crew Type 562
Communication Breakdown; Situational Awareness
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Flight Crew Took Evasive Action
Human Factors
My student and I approached the MXO airport from the northeast and made our initial radio call on the CTAF. From there; we proceeded to fly to the airport to enter the traffic pattern on the left mid-field downwind position. After hearing on the weather frequency that the wind was from 010 at 6 knots; we announced on the CTAF that we would be using runway 33. We continued to update our position on the CTAF frequency all throughout the traffic pattern. Shortly after we turned final to runway 33; my student and I noticed a yellow crop duster flying towards us just a few feet to our left at the same altitude. No radio calls had been made on the CTAF by anyone other than us. After swerving to avoid the crop duster; we were able to finish our final descent and land on runway 33.We proceeded to takeoff; and made another left-hand traffic pattern. On the upwind; we noticed another crop duster taxiing from the ramp to the runways; and during our downwind; we realized that the second crop duster was also taxiing to runway 15. Again; no radio calls were ever made by the crop duster; and the winds were favoring the opposite direction runway. We continued to make our traffic pattern radio calls on the CTAF; but never heard anything from the crop duster; and by the time we were on the left base leg; the crop duster was in the process of taking off down runway 15. Seeing this; my student and I went around; abandoned the pattern; and departed the area to the northeast. These incidents could have easily been prevented by the crop duster pilots monitoring and talking on their radios to the CTAF; and watching for other traffic.
C172 reported NMACs in the pattern at MXO airport with two different crop dusters who appeared to not be using CTAF.