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M03 controller described a loss of heavy jet separation event claiming fusion equipment was a contributing factor.
| Attributes | |
| ACN | 1091005 |
| Time | |
| Date | 201305 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | M03.TRACON |
| State Reference | TN |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | PC-12 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | Other Instrument Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach Departure |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy |
Narrative:
I had just combined both parallel finals at the arm scope; and this was my first time working these positions with fusion. Aircraft X; a B752; was on short final talking to the tower. Aircraft Y; a PC12; was in trail just over 5 miles behind aircraft X. I completed some work with traffic landing runway 18L; and went to ship aircraft Y to the tower. It looked like I had just over 5 miles; but I was later told I only had 4.99. When tower called to coordinate the break out for aircraft Y; it looked like he was at a 5 mile final and aircraft X was no longer observed. I was later told that the spacing was down to 4.86. Fusion made it very difficult to determine spacing because even targets firmly established on the localizer/final approach course wobbled back and forth. If I am forced to use fusion; I will have to loosen my spacing in the final box.
Original NASA ASRS Text
Title: M03 Controller described a loss of heavy jet separation event claiming FUSION equipment was a contributing factor.
Narrative: I had just combined both parallel finals at the ARM scope; and this was my first time working these positions with FUSION. Aircraft X; a B752; was on short final talking to the Tower. Aircraft Y; a PC12; was in trail just over 5 miles behind Aircraft X. I completed some work with traffic landing Runway 18L; and went to ship Aircraft Y to the Tower. It looked like I had just over 5 miles; but I was later told I only had 4.99. When Tower called to coordinate the break out for Aircraft Y; it looked like he was at a 5 mile final and Aircraft X was no longer observed. I was later told that the spacing was down to 4.86. FUSION made it very difficult to determine spacing because even targets firmly established on the localizer/final approach course wobbled back and forth. If I am forced to use FUSION; I will have to loosen my spacing in the final box.
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.