This is an excerpt from a report made to the Aviation Safety Reporting System. The narrative is written by the pilot, rather than FAA or NTSB officials. To maintain anonymity, many details, such as aircraft model or airport, are often scrubbed from the reports.
I had already done one lap in the pattern at LMO and was in the downwind for another lap. In the downwind, the skydiving operation announced a few times, “Jumpers away.” I saw them and told my student to make a slightly wider pattern to accommodate them.
Just as we made a slight deviation, an aircraft, Aircraft Y, entered the pattern mid-field downwind and my ADS-B indicated they were the same altitude as us. Aircraft Y announced they had “downwind traffic in sight” but it was likely another plane.
They cut us off not only in the downwind, but also headed straight for the jump zone. The jump plane announced frantically “parachutes have been deployed.”
I was careful not to climb or descend while I did not have Aircraft Y in sight because ADS-B indicated they were at the same altitude. We did not see them until they were passing just under us. Once I saw them, I asked their intentions with no response. I decided it was best to depart the airport back to BJC.
Upon returning to BJC, I spoke with many instructors from different flight schools in the area and it seems like the traffic pattern at LMO has become increasingly dangerous. Many instructors have had near misses with other pilots not making calls or entering the pattern however they wish.
Primary Problem: Human Factors