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Air carrier Y descent to occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 246592 |
| Time | |
| Date | 199307 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mco |
| State Reference | FL |
| Altitude | msl bound lower : 10000 msl bound upper : 10500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mco |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 2 controller radar : 10 |
| ASRS Report | 246592 |
| 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 | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Busy arrival period. Thought I had descended air carrier X to 9000 ft. Descended air carrier Y to 10000. Conflict alert showed air carrier Y at 10500 and air carrier X at 10000. Air carrier Y issued a turn and got visual with air carrier X. Was not using strip-marking for altitudes because too busy to even look for the strips. Asked for assistance in coordination for another problem area in the northwestern area of airspace and attention diverted from southeast area. Position should have been split earlier (arrival position combined).
Original NASA ASRS Text
Title: ACR Y DSCNT TO OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: BUSY ARR PERIOD. THOUGHT I HAD DSNDED ACR X TO 9000 FT. DSNDED ACR Y TO 10000. CONFLICT ALERT SHOWED ACR Y AT 10500 AND ACR X AT 10000. ACR Y ISSUED A TURN AND GOT VISUAL WITH ACR X. WAS NOT USING STRIP-MARKING FOR ALTS BECAUSE TOO BUSY TO EVEN LOOK FOR THE STRIPS. ASKED FOR ASSISTANCE IN COORD FOR ANOTHER PROB AREA IN THE NORTHWESTERN AREA OF AIRSPACE AND ATTN DIVERTED FROM SE AREA. POS SHOULD HAVE BEEN SPLIT EARLIER (ARR POS COMBINED).
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.