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C90 instructor observes a speed related issue with two aircraft; the second on faster than the first. He advises the developmental; but waits too long for the developmental to do anything and has a loss of separation.
| Attributes | |
| ACN | 1240046 |
| Time | |
| Date | 201502 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | C90.TRACON |
| State Reference | IL |
| Aircraft 1 | |
| Make Model Name | Medium Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | Initial Climb |
| Flight Plan | IFR |
| Person 1 | |
| Function | Instructor Departure Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 11 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Clearance Deviation - Speed All Types |
Narrative:
During training the lead aircraft was assigned to 15;000 feet and was in hand off status to ZAU. The SID restricts the aircraft to 250 kts; a restriction lifted by the center. The trailing aircraft was filed for 12;000 feet and was tower enroute to mke. No speed restriction is assigned to tower enroute aircraft. The trainee put a 3 mile j-ring on the lead aircraft and the trailing aircraft was 4 miles behind. He then assigned normal speed to the trailing aircraft. I immediately queried him on this; citing that this was not positive control and was creating a situation that we had to watch. The trainee did not take action. I waited for him to make a decision (my error). Once we did the aircraft was 2.7 miles and 900 feet.take action sooner.
Original NASA ASRS Text
Title: C90 instructor observes a speed related issue with two aircraft; the second on faster than the first. He advises the Developmental; but waits too long for the Developmental to do anything and has a loss of separation.
Narrative: During training the lead aircraft was assigned to 15;000 Feet and was in hand off status to ZAU. The SID restricts the aircraft to 250 Kts; a restriction lifted by the Center. The trailing aircraft was filed for 12;000 Feet and was tower enroute to MKE. No speed restriction is assigned to tower enroute aircraft. The trainee put a 3 mile J-ring on the lead aircraft and the trailing aircraft was 4 miles behind. He then assigned normal speed to the trailing aircraft. I immediately queried him on this; citing that this was not positive control and was creating a situation that we had to watch. The trainee did not take action. I waited for him to make a decision (my error). Once we did the aircraft was 2.7 miles and 900 feet.Take action sooner.
Data retrieved from NASA's ASRS site 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.