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ZAU controller issues clearance to air carrier twice without response from air carrier. Actions did not ensure separation.
| Attributes | |
| ACN | 451670 |
| Time | |
| Date | 199910 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pmm.vortac |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 15 |
| ASRS Report | 451670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 700 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X and air carrier Y were being sequenced for arrival in the pmm high sector at ZAU. Air carrier X was cleared to turn 'direct pivot intersection' to sequence in front of air carrier Y and to maintain separation. Air carrier X did not turn. The same clearance was issued 2 additional times with no response. Separation was lost between air carrier X and air carrier Y, and the controller was removed from position. This is a high volume, complex sector, and inattention to controller clrncs is a hazardous situation.
Original NASA ASRS Text
Title: ZAU CTLR ISSUES CLRNC TO ACR TWICE WITHOUT RESPONSE FROM ACR. ACTIONS DID NOT ENSURE SEPARATION.
Narrative: ACR X AND ACR Y WERE BEING SEQUENCED FOR ARR IN THE PMM HIGH SECTOR AT ZAU. ACR X WAS CLRED TO TURN 'DIRECT PIVOT INTXN' TO SEQUENCE IN FRONT OF ACR Y AND TO MAINTAIN SEPARATION. ACR X DID NOT TURN. THE SAME CLRNC WAS ISSUED 2 ADDITIONAL TIMES WITH NO RESPONSE. SEPARATION WAS LOST BTWN ACR X AND ACR Y, AND THE CTLR WAS REMOVED FROM POS. THIS IS A HIGH VOLUME, COMPLEX SECTOR, AND INATTENTION TO CTLR CLRNCS IS A HAZARDOUS SIT.
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.