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Air carrier Y descent through occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 282551 |
| Time | |
| Date | 199409 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : air |
| State Reference | OH |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| 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 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 9 |
| ASRS Report | 282551 |
| 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 | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 8000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X eastbound at FL230, air carrier Y wbound at FL240 which had to be descended landing cmh. Several inbounds to cmh, pit inbound rush occurring at same time with lots of vectors for in- trail spacing. Apparently overlooked data block of air carrier X at FL230 (traffic passing over it) and descended wbound from FL240 to FL220. Shortly thereafter told Y to maintain FL240 but he had left FL240 descending. Sector is too small to accomplish the primary task of vectoring and speed controling pit inbound traffic increasing complexity. Procedures are not adequate and not fully adhered to, increasing complexity.
Original NASA ASRS Text
Title: ACR Y DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: ACR X EBOUND AT FL230, ACR Y WBOUND AT FL240 WHICH HAD TO BE DSNDED LNDG CMH. SEVERAL INBOUNDS TO CMH, PIT INBOUND RUSH OCCURRING AT SAME TIME WITH LOTS OF VECTORS FOR IN- TRAIL SPACING. APPARENTLY OVERLOOKED DATA BLOCK OF ACR X AT FL230 (TFC PASSING OVER IT) AND DSNDED WBOUND FROM FL240 TO FL220. SHORTLY THEREAFTER TOLD Y TO MAINTAIN FL240 BUT HE HAD LEFT FL240 DSNDING. SECTOR IS TOO SMALL TO ACCOMPLISH THE PRIMARY TASK OF VECTORING AND SPD CTLING PIT INBOUND TFC INCREASING COMPLEXITY. PROCS ARE NOT ADEQUATE AND NOT FULLY ADHERED TO, INCREASING COMPLEXITY.
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.