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A tower controller reported clearing a B757 for takeoff behind another aircraft with less than the required wake turbulence separation.
| Attributes | |
| ACN | 1376444 |
| Time | |
| Date | 201607 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | IND.Tower |
| State Reference | IN |
| Aircraft 1 | |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Widebody Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 1.0 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
During the outbound push I was working local control with ground control and clearance delivery open. Ind has categorization for wake turbulence. The only wake turbulence we have on the pushes [are for] B757 behind heavies. B757s are notorious for slow spoolup times on the runway. I had a B757 in position with a heavy already cleared for takeoff. I anticipated a small spoolup time for the B757 and cleared them for takeoff. The B757 commenced takeoff immediately. I only had between 3.0 and 3.5 miles of separation when they tagged up. 3.5 miles is required. There is a heavy expectation from our management to get the [these] aircraft out as quickly as possible. Personally I will not anticipate anymore and build in extra space. This will lead to a longer push but it seems the safest option.
Original NASA ASRS Text
Title: A Tower controller reported clearing a B757 for takeoff behind another aircraft with less than the required wake turbulence separation.
Narrative: During the outbound push I was working Local Control with Ground Control and Clearance Delivery open. IND has categorization for wake turbulence. The only wake turbulence we have on the pushes [are for] B757 behind heavies. B757s are notorious for slow spoolup times on the runway. I had a B757 in position with a heavy already cleared for takeoff. I anticipated a small spoolup time for the B757 and cleared them for takeoff. The B757 commenced takeoff immediately. I only had between 3.0 and 3.5 miles of separation when they tagged up. 3.5 miles is required. There is a heavy expectation from our management to get the [these] aircraft out as quickly as possible. Personally I will not anticipate anymore and build in extra space. This will lead to a longer push but it seems the safest option.
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.