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Air carrier Y climb to occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 281797 |
| Time | |
| Date | 199408 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dpa |
| State Reference | IL |
| Altitude | msl bound lower : 15000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zau |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 6 |
| ASRS Report | 281797 |
| 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 | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 25200 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was climbed to 15000 ft, traffic at 16000 ft. Air carrier Y was climbed to 14000 ft and turned to put on track. Air carrier X was observed at 15100 ft. Air carrier Y was then climbed to 15000 ft. The cause of the problem was simple -- I thought air carrier X was climbing to FL230, when I saw him at 15100 ft.
Original NASA ASRS Text
Title: ACR Y CLB TO OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: ACR X WAS CLBED TO 15000 FT, TFC AT 16000 FT. ACR Y WAS CLBED TO 14000 FT AND TURNED TO PUT ON TRACK. ACR X WAS OBSERVED AT 15100 FT. ACR Y WAS THEN CLBED TO 15000 FT. THE CAUSE OF THE PROB WAS SIMPLE -- I THOUGHT ACR X WAS CLBING TO FL230, WHEN I SAW HIM AT 15100 FT.
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.