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2 same company DC9 air carrier on the same arrival are both cleared to cross the same fix at 12000 ft resulting in a loss of separation.
| Attributes | |
| ACN | 563058 |
| Time | |
| Date | 200210 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : cetus |
| State Reference | OH |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : ns |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller military : 9 controller radar : 9.5 |
| ASRS Report | 563058 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment : conflict alert atc equipment other atc equipment : radar other controllera other controllerb other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 25800 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X data block inadvertently dropped off scope, was instructed to cross cetus intersection at 12000 ft. Aircraft Y was at 13000 ft, was descended to 12000 ft. Conflict alert went off and action was taken to separate traffic. Data block inadvertently dropped off scope by the d-side controller.
Original NASA ASRS Text
Title: 2 SAME COMPANY DC9 ACR ON THE SAME ARR ARE BOTH CLRED TO CROSS THE SAME FIX AT 12000 FT RESULTING IN A LOSS OF SEPARATION.
Narrative: ACFT X DATA BLOCK INADVERTENTLY DROPPED OFF SCOPE, WAS INSTRUCTED TO CROSS CETUS INTXN AT 12000 FT. ACFT Y WAS AT 13000 FT, WAS DSNDED TO 12000 FT. CONFLICT ALERT WENT OFF AND ACTION WAS TAKEN TO SEPARATE TFC. DATA BLOCK INADVERTENTLY DROPPED OFF SCOPE BY THE D-SIDE 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.