Narrative:

Air carrier X; was on the Fincher1 arrival on a left downwind for runway 36L. I had assigned air carrier X 2;000 ft and the assigned speed at that point on the arrival is 210 KTS. I also had air carrier Y; an inbound on the Tammi4 arrival. Air carrier Y was on a left base for runway 36R to stagger behind air carrier X. I noticed that air carrier X was slowing and asked if they were still doing 210 KTS; and they responded that they weren't. I asked why and they responded that they needed to land the aircraft. I mentioned that the assigned speed was 210 KTS and that they slowed without telling me; and that I now needed them to maintain 190 KTS until further advised. I then slowed air carrier Y to 210 KTS to keep my stagger. I turned air carrier X's base and then turned them to join the localizer and cleared them for the approach; assigning 190 KTS until further advised. Air carrier X said they needed slower so I assigned them 170 KTS and told them that all they had to do was let me know. Air carrier X did not like my attitude and asked for the phone number. I have become quite tired of air carrier X company pilots pulling this; so when I gave him the number; I told him it was for a possible pilot deviation. I turned air carrier Y to join the runway 36R localizer and cleared them for the approach keeping my stagger with air carrier X. This is not the first time that an air carrier X company pilot has done this; but it is the first time that I have wanted them to call the facility. I am not proud of the attitude that I displayed; but I am just tired of dealing with this. All I ask is that the air carrier X pilots either fly the arrivals as published or they advise that they need to deviate from published procedures; especially in the final box. Air carrier X pilots seem quite content to let their FMS fly the plane and not inform anyone of what they might be doing. This becomes critical when I am trying to set up a sequence and basing that sequence on arrival assigned speeds that these pilots then bust.

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Original NASA ASRS Text

Title: TRACON Controller experienced a conflict event when traffic assigned a STAR reduced speed below published requirements; the reporter noting this the subject company frequently reduces without notifying ATC.

Narrative: Air Carrier X; was on the Fincher1 arrival on a left downwind for Runway 36L. I had assigned Air Carrier X 2;000 FT and the assigned speed at that point on the arrival is 210 KTS. I also had Air Carrier Y; an inbound on the Tammi4 arrival. Air Carrier Y was on a left base for Runway 36R to stagger behind Air Carrier X. I noticed that Air Carrier X was slowing and asked if they were still doing 210 KTS; and they responded that they weren't. I asked why and they responded that they needed to land the aircraft. I mentioned that the assigned speed was 210 KTS and that they slowed without telling me; and that I now needed them to maintain 190 KTS until further advised. I then slowed Air Carrier Y to 210 KTS to keep my stagger. I turned Air Carrier X's base and then turned them to join the localizer and cleared them for the approach; assigning 190 KTS until further advised. Air Carrier X said they needed slower so I assigned them 170 KTS and told them that all they had to do was let me know. Air Carrier X did not like my attitude and asked for the phone number. I have become quite tired of Air Carrier X company pilots pulling this; so when I gave him the number; I told him it was for a possible pilot deviation. I turned Air Carrier Y to join the Runway 36R localizer and cleared them for the approach keeping my stagger with Air Carrier X. This is not the first time that an Air Carrier X company pilot has done this; but it is the first time that I have wanted them to call the facility. I am not proud of the attitude that I displayed; but I am just tired of dealing with this. All I ask is that the Air Carrier X pilots either fly the arrivals as published or they advise that they need to deviate from published procedures; especially in the final box. Air Carrier X pilots seem quite content to let their FMS fly the plane and not inform anyone of what they might be doing. This becomes critical when I am trying to set up a sequence and basing that sequence on arrival assigned speeds that these pilots then bust.

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.