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Controller and pilots report of being cleared for takeoff and an aircraft that was cleared to cross the runway did in a slow manner. Controller thought aircraft had already crossed and then cleared the carrier. Carrier started takeoff roll and observed red lights down field and aborted takeoff.
| Attributes | |
| ACN | 1285997 |
| Time | |
| Date | 201508 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | SEA.Tower |
| State Reference | WA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Taxi |
| Route In Use | None |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Large Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 2 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Conflict Ground Conflict Less Severe Deviation - Procedural Clearance Ground Incursion Runway |
Narrative:
Aircraft Y was instructed to line up and wait and was told that traffic would cross downfield. Aircraft Z was given a crossing clearance across runway 16L at north and told that traffic was holding in position. Immediately thereafter aircraft X was given a crossing clearance and told of the holding traffic. I then assigned visual separation to the preceding departure; changed them to departure; and then scanned my line-up for strip accuracy and potential crossing holes. I then looked up at aircraft Y; scanned the runway; which was clear; and gave aircraft Y his take-off clearance. I did not see that aircraft X had not crossed the runway yet; and after my scan down the runway they started their crossing. At which point aircraft Y said they saw the red lights and were aborting their take-off for traffic crossing in front of them.the only changes that I would make are based on my actions. There were contributing factors at play that I did not take as seriously as I should have.
Original NASA ASRS Text
Title: Controller and pilots report of being cleared for takeoff and an aircraft that was cleared to cross the runway did in a slow manner. Controller thought aircraft had already crossed and then cleared the carrier. Carrier started takeoff roll and observed red lights down field and aborted takeoff.
Narrative: Aircraft Y was instructed to line up and wait and was told that traffic would cross downfield. Aircraft Z was given a crossing clearance across RWY 16L at N and told that traffic was holding in position. Immediately thereafter aircraft X was given a crossing clearance and told of the holding traffic. I then assigned visual separation to the preceding departure; changed them to departure; and then scanned my line-up for strip accuracy and potential crossing holes. I then looked up at aircraft Y; scanned the runway; which was clear; and gave aircraft Y his take-off clearance. I did not see that aircraft X had not crossed the runway yet; and after my scan down the runway they started their crossing. At which point aircraft Y said they saw the red lights and were aborting their take-off for traffic crossing in front of them.The only changes that I would make are based on my actions. There were contributing factors at play that I did not take as seriously as I should have.
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.