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Two controllers and a flight crew were involved describe a runway incursion by rescue vehicles on a training mission. The lead vehicle had been instructed to cross runway 4L and hold short of 31C; but read back cross 4R and hold short of 31L and was not corrected by the ground controller. The crew is at rotate speed when the vehicles are detected and the takeoff is continued.
| Attributes | |
| ACN | 1269499 |
| Time | |
| Date | 201506 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | MDW.Airport |
| State Reference | IL |
| Aircraft 1 | |
| Make Model Name | Large Transport |
| Flight Phase | Takeoff |
| Route In Use | None |
| Flight Plan | IFR |
| Person 1 | |
| Function | Local |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 3 |
| Person 2 | |
| Function | Ground |
| Events | |
| Anomaly | Conflict Ground Conflict Less Severe Deviation - Procedural Clearance Ground Incursion Runway |
Narrative:
While working on local; I coordinated a runway crossing with the ground controller so that they could cross runway 31C behind my departing traffic. While [an aircraft] was on the departure roll; several emergency vehicles crossed on the west taxiway. The airport surface detection equipment (asde) alarm alerted and I advised the aircraft to use caution for the vehicles downfield. The departure lifted over and prior to the crossing vehicles and continued without incident. While vehicles are practicing on the airport surface; extra care should be taken with progressive instructions and readback accuracy.
Original NASA ASRS Text
Title: Two Controllers and a flight Crew were involved describe a runway incursion by rescue vehicles on a training mission. The lead vehicle had been instructed to cross Runway 4L and hold short of 31C; but read back cross 4R and hold short of 31L and was not corrected by the Ground Controller. The crew is at rotate speed when the vehicles are detected and the takeoff is continued.
Narrative: While working on local; I coordinated a runway crossing with the ground controller so that they could cross runway 31C behind my departing traffic. While [an aircraft] was on the departure roll; several emergency vehicles crossed on the W taxiway. The Airport Surface Detection Equipment (ASDE) alarm alerted and I advised the aircraft to use caution for the vehicles downfield. The departure lifted over and prior to the crossing vehicles and continued without incident. While vehicles are practicing on the airport surface; extra care should be taken with progressive instructions and readback accuracy.
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.