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Less than standard separation occurred between an aircraft climbing to FL370 and an aircraft level at FL350.
| Attributes | |
| ACN | 150108 |
| Time | |
| Date | 199007 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : shv |
| State Reference | LA |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | arrival other enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 4 |
| ASRS Report | 150108 |
| 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 non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Medium large transport X was climbing off iah to shu to FL370. Medium large transport Y was on the elm grove transition of the scy 9 arrival to dfw at FL350 when the C/a went off. I turned both aircraft to the left 60 degrees. Medium large transport X turned but medium large transport Y was called medium large transport Z. He asked if the turn was for medium large transport Y, then questioned the clearance again 40 seconds later. The C/a went off less than 1 mi before sep was lost. The incident occurred at the paxto high sector during a busy period staffed by 1 controller.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION OCCURRED BETWEEN AN ACFT CLIMBING TO FL370 AND AN ACFT LEVEL AT FL350.
Narrative: MLG X WAS CLBING OFF IAH TO SHU TO FL370. MLG Y WAS ON THE ELM GROVE TRANSITION OF THE SCY 9 ARR TO DFW AT FL350 WHEN THE C/A WENT OFF. I TURNED BOTH ACFT TO THE LEFT 60 DEGS. MLG X TURNED BUT MLG Y WAS CALLED MLG Z. HE ASKED IF THE TURN WAS FOR MLG Y, THEN QUESTIONED THE CLRNC AGAIN 40 SECS LATER. THE C/A WENT OFF LESS THAN 1 MI BEFORE SEP WAS LOST. THE INCIDENT OCCURRED AT THE PAXTO HIGH SECTOR DURING A BUSY PERIOD STAFFED BY 1 CTLR.
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.