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ZAU controller providing OJT described a loss of separation event when the developmental misjudged the spacing required and was momentarily blocked when trying issue corrective instructions; reporter adding over flight traffic contributed to the event.
| Attributes | |
| ACN | 863787 |
| Time | |
| Date | 200912 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZAU.ARTCC |
| State Reference | IL |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | None |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Gulfstream IV / G350 / G450 |
| Flight Phase | Descent Cruise |
| Person 1 | |
| Function | Instructor |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy |
Narrative:
I was instructing. The radar person I was training has many years of service and was being retrained on a new position. The sector was moderately busy; but not busy enough for a d-side. Air carrier X was leading the mdw rush followed by a giv. Air carrier X was assigned 310+ and the giv was assigned m75-. We had 5.5 miles between the 2 aircraft and increasing. Air carrier Y at FL260 was much faster then the giv. My trainee cleared the giv down to FL240; which he started at FL280. I immediately told my trainee to stop the giv at FL270; an aircraft transmission prevented him from calling back and stopping him. Once the aircraft cleared the frequency; the trainee told the giv to stop at FL270. The loss of separation occurred about 20 seconds from the time the clearance was issued and the trainee trying to correct it. What hindered us was no flow restrictions to mdw at the time and cleveland center giving us an overflight underneath an arrival. This scenario happens all the time. Recommendation; require cleveland center to stop putting overflights underneath our arrivals. This problem has persisted for as long as I can remember.
Original NASA ASRS Text
Title: ZAU controller providing OJT described a loss of separation event when the developmental misjudged the spacing required and was momentarily blocked when trying issue corrective instructions; reporter adding over flight traffic contributed to the event.
Narrative: I was instructing. The RADAR person I was training has many years of service and was being retrained on a new position. The sector was moderately busy; but not busy enough for a D-side. Air Carrier X was leading the MDW rush followed by a GIV. Air Carrier X was assigned 310+ and the GIV was assigned m75-. We had 5.5 miles between the 2 aircraft and increasing. Air Carrier Y at FL260 was much faster then the GIV. My trainee cleared the GIV down to FL240; which he started at FL280. I immediately told my trainee to stop the GIV at FL270; an aircraft transmission prevented him from calling back and stopping him. Once the aircraft cleared the frequency; the trainee told the GIV to stop at FL270. The loss of separation occurred about 20 seconds from the time the clearance was issued and the trainee trying to correct it. What hindered us was no flow restrictions to MDW at the time and Cleveland Center giving us an overflight underneath an arrival. This scenario happens all the time. Recommendation; require Cleveland Center to stop putting overflights underneath our arrivals. This problem has persisted for as long as I can remember.
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.