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Air carrier X climb to occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 299799 |
| Time | |
| Date | 199503 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dqn |
| State Reference | OH |
| 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 | climbout : intermediate altitude |
| Route In Use | enroute airway : zid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340A |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller non radar : 5 controller radar : 3 |
| ASRS Report | 299799 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 16200 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X jet departed day, oh, northbound to dtw. Air carrier Y SF34 was northbound at 15000 ft, just north of dqn VOR. I issued a clearance to X to maintain 15000 ft, intending to clear him only to 14000 ft. I entered an interim altitude of 14000 ft in X data block. A few mins later, as I began to call traffic for X, I noticed 14200 ft in the data block. I told X to maintain 14000 ft, he said early clearance was 15000 ft. I told X to expedite to 14000 ft, assigned Y a 090 degree heading, and assigned the X a 270 degree heading. This event occurred as I had just taken over the sector and the prior controller had returned to inform me of some WX information. I believe I was somewhat distracted when I issued X 15000 ft instead of 14000 ft as I had intended.
Original NASA ASRS Text
Title: ACR X CLB TO OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: ACR X JET DEPARTED DAY, OH, NBOUND TO DTW. ACR Y SF34 WAS NBOUND AT 15000 FT, JUST N OF DQN VOR. I ISSUED A CLRNC TO X TO MAINTAIN 15000 FT, INTENDING TO CLR HIM ONLY TO 14000 FT. I ENTERED AN INTERIM ALT OF 14000 FT IN X DATA BLOCK. A FEW MINS LATER, AS I BEGAN TO CALL TFC FOR X, I NOTICED 14200 FT IN THE DATA BLOCK. I TOLD X TO MAINTAIN 14000 FT, HE SAID EARLY CLRNC WAS 15000 FT. I TOLD X TO EXPEDITE TO 14000 FT, ASSIGNED Y A 090 DEG HDG, AND ASSIGNED THE X A 270 DEG HDG. THIS EVENT OCCURRED AS I HAD JUST TAKEN OVER THE SECTOR AND THE PRIOR CTLR HAD RETURNED TO INFORM ME OF SOME WX INFO. I BELIEVE I WAS SOMEWHAT DISTRACTED WHEN I ISSUED X 15000 FT INSTEAD OF 14000 FT AS I HAD INTENDED.
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.