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Ord local controller reported a departing A321 climbed at a much slower speed than expected resulting in less than standard separation with the subsequent departure.
| Attributes | |
| ACN | 1411270 |
| Time | |
| Date | 201612 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ORD.Tower |
| State Reference | IL |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 4 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy |
Narrative:
I was working local control for aircraft departing. I coordinated a heavy jet departure on the SID to a fix then heading 180. The previous departure was an A321 on a SID that was also on a 180 heading. I turned the heavy jet to a 180 heading before I switched them to departure control. I had 3 miles separation and the heavy jet was quite a bit slower than the A321. After both aircraft leveled off; the A321 slowed down and the heavy jet sped up.I recommend assign first aircraft 250 knots so they can't slow down.
Original NASA ASRS Text
Title: ORD Local Controller reported a departing A321 climbed at a much slower speed than expected resulting in less than standard separation with the subsequent departure.
Narrative: I was working Local Control for aircraft departing. I coordinated a Heavy jet departure on the SID to a fix then heading 180. The previous departure was an A321 on a SID that was also on a 180 heading. I turned the Heavy jet to a 180 heading before I switched them to Departure Control. I had 3 miles separation and the Heavy jet was quite a bit slower than the A321. After both aircraft leveled off; the A321 slowed down and the Heavy jet sped up.I recommend assign first aircraft 250 knots so they can't slow down.
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.