 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ARTCC radar controller did not see the potential conflict less than standard separation between an air carrier MD80 and an L329 at the same altitude until approximately 3 mins before separation would be lost. The controller turned both aircraft, but not in time to prevent a system error. Reporter says the conflict alert did not activate.
| Attributes | |
| ACN | 357774 |
| Time | |
| Date | 199612 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : vxv |
| State Reference | TN |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Jetstar 1329 (C140) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 15 controller radar : 13 |
| ASRS Report | 357774 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
An MD80 nebound over vxv, and an L329 sbound over vxv, both aircraft at FL370. Controller did not see conflict until about 3 mins before the 2 aircraft would have merged over vxv. Controller turned the MD80 north to a 360 degree heading and turned the L329 30 degrees left. Separation was lost at 4 mi apart. Conflict alert never did activate. Controller fatigue also may have been a factor.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR DID NOT SEE THE POTENTIAL CONFLICT LTSS BTWN AN ACR MD80 AND AN L329 AT THE SAME ALT UNTIL APPROX 3 MINS BEFORE SEPARATION WOULD BE LOST. THE CTLR TURNED BOTH ACFT, BUT NOT IN TIME TO PREVENT A SYS ERROR. RPTR SAYS THE CONFLICT ALERT DID NOT ACTIVATE.
Narrative: AN MD80 NEBOUND OVER VXV, AND AN L329 SBOUND OVER VXV, BOTH ACFT AT FL370. CTLR DID NOT SEE CONFLICT UNTIL ABOUT 3 MINS BEFORE THE 2 ACFT WOULD HAVE MERGED OVER VXV. CTLR TURNED THE MD80 N TO A 360 DEG HDG AND TURNED THE L329 30 DEGS L. SEPARATION WAS LOST AT 4 MI APART. CONFLICT ALERT NEVER DID ACTIVATE. CTLR FATIGUE ALSO MAY HAVE BEEN A FACTOR.
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.