Narrative:

Aircraft X was given clearance for an initial to ama at 055 by approach control. Aircraft X readback the altitude correctly. Approach control told aircraft X to switch to tower and report 5 mile initial. Before aircraft X called tower; he descended to 050 on his own. Aircraft X called tower approximately 5 miles from the runway and reported the 5 mile initial. Aircraft X became a direct conflict with aircraft Y who was turning right base to runway 22 also at 050. Tower advised aircraft X that initial altitude was 055 and to climb immediately to avoid aircraft Y. Aircraft X passed over the top of aircraft Y. Aircraft X was given the left break at the departure end of the runway. Aircraft Y did a touch and go then proceeded into the right closed traffic pattern. Aircraft Z was given the visual approach to runway 22 and shipped to tower approximately 8 miles out. Aircraft Z was given a landing clearance by tower for runway 22. Aircraft X entered the left downwind for runway 22 left closed traffic pattern at 055. Tower advised aircraft X that the traffic pattern is 050 and descended him to that altitude. Tower issued traffic to aircraft X about aircraft Z and vise versa. Aircraft Z reported the T38 in sight and was is told to maintain visual with the traffic. Tower then told aircraft X to turn right to 090 degrees and maintain 050 for the aircraft Z traffic. Aircraft X declined the vector and declared minimum fuel. Tower tells aircraft X another two times to turn right to 090 degrees and maintain 050 for the traffic but aircraft X declines both vectors & says he is turning left to 220 degrees to land. Tower declared emergency fuel for aircraft X; told aircraft Z to turn right to 270 degrees to avoid aircraft X. Aircraft Z was now heading 270 degrees at 050. Aircraft Y was in the right downwind approaching aircraft Z also at 050. Tower advised aircraft Y to climb immediately to 060 for traffic and issued a traffic alert. Tower advised aircraft Y twice to climb because his data block read that he was at 051. Aircraft Y stated after the traffic alert that he is level at 060 even through the data block still read 051. All three aircraft landed without incident.

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Original NASA ASRS Text

Title: AMA Controller described a VFR pattern conflict when an inbound military aircraft failed to comply with published/assigned 'initial procedure' altitudes resulting in a conflict with traffic on base.

Narrative: Aircraft X was given clearance for an initial to AMA at 055 by Approach Control. Aircraft X readback the altitude correctly. Approach Control told Aircraft X to switch to Tower and report 5 mile initial. Before Aircraft X called Tower; he descended to 050 on his own. Aircraft X called Tower approximately 5 miles from the runway and reported the 5 mile initial. Aircraft X became a direct conflict with Aircraft Y who was turning right base to Runway 22 also at 050. Tower advised Aircraft X that initial altitude was 055 and to climb immediately to avoid Aircraft Y. Aircraft X passed over the top of Aircraft Y. Aircraft X was given the left break at the departure end of the runway. Aircraft Y did a touch and go then proceeded into the right closed traffic pattern. Aircraft Z was given the visual approach to Runway 22 and shipped to Tower approximately 8 miles out. Aircraft Z was given a landing clearance by Tower for Runway 22. Aircraft X entered the left downwind for Runway 22 left closed traffic pattern at 055. Tower advised Aircraft X that the traffic pattern is 050 and descended him to that altitude. Tower issued traffic to Aircraft X about Aircraft Z and vise versa. Aircraft Z reported the T38 in sight and was is told to maintain visual with the traffic. Tower then told Aircraft X to turn right to 090 degrees and maintain 050 for the Aircraft Z traffic. Aircraft X declined the vector and declared minimum fuel. Tower tells Aircraft X another two times to turn right to 090 degrees and maintain 050 for the traffic but Aircraft X declines both vectors & says he is turning left to 220 degrees to land. Tower declared emergency fuel for Aircraft X; told Aircraft Z to turn right to 270 degrees to avoid Aircraft X. Aircraft Z was now heading 270 degrees at 050. Aircraft Y was in the right downwind approaching Aircraft Z also at 050. Tower advised Aircraft Y to climb immediately to 060 for traffic and issued a traffic alert. Tower advised Aircraft Y twice to climb because his data block read that he was at 051. Aircraft Y stated after the traffic alert that he is level at 060 even through the data block still read 051. All three aircraft landed without incident.

Data retrieved from NASA's ASRS site as of July 2013 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.