Narrative:

It was a sunny morning. There were at least six other aircraft in the pattern and area. As busy as it was; all pilots were doing an excellent job over the past two hours with continuous position reports. The pilots were giving good reports; local landmarks (over the lake; the freeway; the speedway; etc) distance and altitude etc. While in the pattern; I was at midfield downwind; one half mile wide pattern; when I heard the pipeline patrol pilot report '3 miles south; will cross the approach end of 30' the active runway. I made my position reports and continued the landing pattern. Other aircraft made reports and continued as well. I heard nothing further from the pipeline patrol aircraft. When I made my final approach call; I was on .5 mile final; less than 400 ft AGL and descending. At that point the pipeline pilot asked me on the radio where I was. I looked to my left and saw him on a 90 degree collision intercept over the ILS lights. I called him and said; 'I am right below you. Climb climb climb' and I continued my final approach as I was now 100 feet and over the approach. I saw his shadow go over me. Nothing more was heard from him on the radio as he departed to the north-northwest. I estimated he was less than 100 ft above me. Other CFI on the ground who witnessed it said 200 ft. For some reason I thought he was going to over fly the airport at 2;500 ft MSL (1;540 AGL) and not 300 ft AGL. Tpa is 1;760 MSL; 800 AGL. I respect that the pipeline patrol pilot has a job to do. However; he could have caused a collision with his insistence on flying through the busy pattern area; over the ILS lights on final approach while there several aircraft in the pattern.

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Original NASA ASRS Text

Title: Pipeline Patrol flew through traffic pattern of an uncontrolled airport during period of high activity resulting in a NMAC.

Narrative: It was a sunny morning. There were at least six other aircraft in the pattern and area. As busy as it was; all pilots were doing an excellent job over the past two hours with continuous position reports. The pilots were giving good reports; local landmarks (over the lake; the freeway; the speedway; etc) distance and altitude etc. While in the pattern; I was at midfield downwind; one half mile wide pattern; when I heard the pipeline patrol pilot report '3 miles south; will cross the approach end of 30' the active runway. I made my position reports and continued the landing pattern. Other aircraft made reports and continued as well. I heard nothing further from the pipeline patrol aircraft. When I made my final approach call; I was on .5 mile final; less than 400 FT AGL and descending. At that point the pipeline pilot asked me on the radio where I was. I looked to my left and saw him on a 90 degree collision intercept over the ILS lights. I called him and said; 'I am right below you. CLIMB CLIMB CLIMB' and I continued my final approach as I was now 100 feet and over the approach. I saw his shadow go over me. Nothing more was heard from him on the radio as he departed to the north-northwest. I estimated he was less than 100 FT above me. Other CFI on the ground who witnessed it said 200 FT. For some reason I thought he was going to over fly the airport at 2;500 FT MSL (1;540 AGL) and not 300 FT AGL. TPA is 1;760 MSL; 800 AGL. I respect that the pipeline patrol pilot has a job to do. However; he could have caused a collision with his insistence on flying through the busy pattern area; over the ILS lights on final approach while there several aircraft in the pattern.

Data retrieved from NASA's ASRS site as of April 2012 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.