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Controller forgets about the assigned altitude issued to an aircraft and vectors another aircraft in close proximity resulting in less than standard separation.
| Attributes | |
| ACN | 200569 |
| Time | |
| Date | 199201 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mgm |
| State Reference | AL |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mgm |
| Operator | other |
| Make Model Name | Helicopter |
| Flight Phase | climbout : initial |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| ASRS Report | 200569 |
| Person 2 | |
| Affiliation | government : military |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : military |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air taxi departed dannelly field runway 27 on runway heading climbing to 3000 ft. An army mlt departed airport heading 210 degree climbing to 3000 ft. I climbed the helicopter to 5000 ft on initial contact. I climbed the air taxi to 4000 ft and turned him south to separate him from another aircraft at 5000 ft. When I looked at the strips I mistakenly looked at another mlt's strip with similar call sign indicating assigned altitude of 3000 ft. I turned the air taxi on course to the east. When I looked at the scope I saw the air taxi and mlt on converging courses, at 4000 ft. I had the air taxi expedite climb to 7000 ft and the helicopter descend to 3000 ft. Standard IFR separation was lost (less that 3 mi). The air taxi reported the helicopter in sight and was instructed to maintain visual separation. Cause was lack of concentration after almost 2 hours of working heavy complex traffic. I have not worked this type of traffic in almost 3 yrs and my proficiency was not sufficient for the task.
Original NASA ASRS Text
Title: CTLR FORGETS ABOUT THE ASSIGNED ALT ISSUED TO AN ACFT AND VECTORS ANOTHER ACFT IN CLOSE PROX RESULTING IN LTSS.
Narrative: AIR TAXI DEPARTED DANNELLY FIELD RWY 27 ON RWY HDG CLBING TO 3000 FT. AN ARMY MLT DEPARTED ARPT HDG 210 DEG CLBING TO 3000 FT. I CLBED THE HELI TO 5000 FT ON INITIAL CONTACT. I CLBED THE AIR TAXI TO 4000 FT AND TURNED HIM S TO SEPARATE HIM FROM ANOTHER ACFT AT 5000 FT. WHEN I LOOKED AT THE STRIPS I MISTAKENLY LOOKED AT ANOTHER MLT'S STRIP WITH SIMILAR CALL SIGN INDICATING ASSIGNED ALT OF 3000 FT. I TURNED THE AIR TAXI ON COURSE TO THE E. WHEN I LOOKED AT THE SCOPE I SAW THE AIR TAXI AND MLT ON CONVERGING COURSES, AT 4000 FT. I HAD THE AIR TAXI EXPEDITE CLB TO 7000 FT AND THE HELI DSND TO 3000 FT. STANDARD IFR SEPARATION WAS LOST (LESS THAT 3 MI). THE AIR TAXI RPTED THE HELI IN SIGHT AND WAS INSTRUCTED TO MAINTAIN VISUAL SEPARATION. CAUSE WAS LACK OF CONCENTRATION AFTER ALMOST 2 HRS OF WORKING HVY COMPLEX TFC. I HAVE NOT WORKED THIS TYPE OF TFC IN ALMOST 3 YRS AND MY PROFICIENCY WAS NOT SUFFICIENT FOR THE TASK.
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.