Narrative:

I was performing pattern work at LOM. Although there was a moderate amount of commercial and private traffic; no sequencing problems arose until aircraft Y ignored my radio calls that I was turning left downwind and took advantage of an altitude below the standard 1500 feet pattern at LOM to pass my aircraft after I was established on left downwind. I expressed surprise over the radio but was met only with laughter. Aircraft Y continued ahead of me and landed at LOM. After landing; I asked the pilot why he cut me off in the pattern. His excuse was 'you were above pattern altitude.' I am based at LOM and hold pattern altitude religiously once turning downwind from the upwind/crosswind climb. He was at perhaps 1300 feet. I made a corrective maneuver and did not attempt to reassert my position as #1 in the pattern. On the ground; his passenger stated 'you only announced left crosswind;' a lie; as the crew at LOM (who heard the incident on the radio) always joke with me for announcing my every turn and position. The pilot did not respond when I quoted the far that states an aircraft at a lower altitude (in this case; deliberately below the official pattern altitude at LOM) shall not take advantage of that fact to cut off another aircraft [on final; but this goes for any leg of the pattern.]I think my hands have finally stopped shaking. A student pilot with fewer hours would have been traumatized by the close call.

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Original NASA ASRS Text

Title: GA pilot reported on downwind at LOM being passed underneath by another GA aircraft that continued on to a landing that required a corrective maneuver for separation.

Narrative: I was performing pattern work at LOM. Although there was a moderate amount of commercial and private traffic; no sequencing problems arose until Aircraft Y ignored my radio calls that I was turning left downwind and took advantage of an altitude below the standard 1500 feet pattern at LOM to pass my aircraft AFTER I was established on left downwind. I expressed surprise over the radio but was met only with laughter. Aircraft Y continued ahead of me and landed at LOM. After landing; I asked the pilot why he cut me off in the pattern. His excuse was 'you were above pattern altitude.' I am based at LOM and hold pattern altitude religiously once turning downwind from the upwind/crosswind climb. He was at perhaps 1300 feet. I made a corrective maneuver and did not attempt to reassert my position as #1 in the pattern. On the ground; his passenger stated 'you only announced left crosswind;' a lie; as the crew at LOM (who heard the incident on the radio) always joke with me for announcing my every turn and position. The pilot did not respond when I quoted the FAR that states an aircraft at a lower altitude (in this case; deliberately below the official pattern altitude at LOM) shall NOT take advantage of that fact to cut off another aircraft [on final; but this goes for any leg of the pattern.]I think my hands have finally stopped shaking. A student pilot with fewer hours would have been traumatized by the close call.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.