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Air carrier X had less than standard separation from 2 air carrier Y's which crossed runway after air carrier X had been cleared for takeoff. System error.
| Attributes | |
| ACN | 187811 |
| Time | |
| Date | 199109 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mdw |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : takeoff ground : holding |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | ground other : taxi |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 11000 flight time type : 6000 |
| ASRS Report | 187811 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : ground less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | Other |
| Miss Distance | horizontal : 200 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure Operational Error |
Narrative:
Air carrier X was in #1 position holding short of runway 31C on southwest side on taxiway right at mdw. Air carrier X was cleared for takeoff with left turn to 250 degree heading from that position by mdw tower. Air carrier X taxied onto runway 31C intending to do a rolling takeoff. As I turned to line up on runway 31C, I noticed 2 air carrier Y medium large transport's taxiing south on taxiway P at a fast rate of taxi. I was not sure the first would or even could hold short of the runway, so I stopped in position at the end of runway 31C. I never did advance throttles for takeoff. Both air carrier Y aircraft taxied across runway 31C (in front of me) without slowing down. I then had copilot confirm with the tower we were cleared for takeoff, and tower repeated takeoff clearance. Normal takeoff after this point. I am sure if I had made a normal rolling takeoff I would have collided with the first aircraft. Callback conversation with reporter revealed the following information: the reporter stated he had called the tower supervisor after arrival at destination and the supervisor said the ground controller had misunderstood the coordination with the local controller and cleared the 2 aircraft to cross the runway in front of air carrier X.
Original NASA ASRS Text
Title: ACR X HAD LTSS FROM 2 ACR Y'S WHICH CROSSED RWY AFTER ACR X HAD BEEN CLRED FOR TKOF. SYS ERROR.
Narrative: ACR X WAS IN #1 POS HOLDING SHORT OF RWY 31C ON SW SIDE ON TAXIWAY R AT MDW. ACR X WAS CLRED FOR TKOF WITH L TURN TO 250 DEG HDG FROM THAT POS BY MDW TWR. ACR X TAXIED ONTO RWY 31C INTENDING TO DO A ROLLING TKOF. AS I TURNED TO LINE UP ON RWY 31C, I NOTICED 2 ACR Y MLG'S TAXIING S ON TAXIWAY P AT A FAST RATE OF TAXI. I WAS NOT SURE THE FIRST WOULD OR EVEN COULD HOLD SHORT OF THE RWY, SO I STOPPED IN POS AT THE END OF RWY 31C. I NEVER DID ADVANCE THROTTLES FOR TKOF. BOTH ACR Y ACFT TAXIED ACROSS RWY 31C (IN FRONT OF ME) WITHOUT SLOWING DOWN. I THEN HAD COPLT CONFIRM WITH THE TWR WE WERE CLRED FOR TKOF, AND TWR REPEATED TKOF CLRNC. NORMAL TKOF AFTER THIS POINT. I AM SURE IF I HAD MADE A NORMAL ROLLING TKOF I WOULD HAVE COLLIDED WITH THE FIRST ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE HAD CALLED THE TWR SUPVR AFTER ARR AT DEST AND THE SUPVR SAID THE GND CTLR HAD MISUNDERSTOOD THE COORD WITH THE LCL CTLR AND CLRED THE 2 ACFT TO CROSS THE RWY IN FRONT OF ACR X.
Data retrieved from NASA's ASRS site as of July 2007 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.