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Controller issued descent through occupied altitude to wrong aircraft. Air carrier Y had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 202793 |
| Time | |
| Date | 199202 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mfd |
| State Reference | OH |
| Altitude | msl bound lower : 22000 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar oversight : supervisor |
| Qualification | controller : radar |
| Experience | controller supervisory : 8 |
| ASRS Report | 202793 |
| 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 | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 13200 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was traversing the mmn sector at FL220. 2 arrs same company aircraft destined to clear would cross the flight path of air carrier X, both at FL230, first air carrier followed by air carrier Y was given a clearance to cross 15 southwest djb (dryer VORTAC) at 10000 ft. First air carrier did not start his descent to 10000 so a clearance was issued for him to remain at FL230 until he passed air carrier X. Traffic was issued to air carrier Y that air carrier Y was at FL220 and approximately 15 mi. First air carrier was not clear of the j-ring and I issued a descent clearance to what I thought was first air carrier. The clearance that I gave was to air carrier Y who was in conflict with air carrier X. As a note the descent clearance given to air carrier Y was given 6 seconds after I issued the traffic at FL220.
Original NASA ASRS Text
Title: CTLR ISSUED DSCNT THROUGH OCCUPIED ALT TO WRONG ACFT. ACR Y HAD LTSS FROM ACR X. SYS ERROR.
Narrative: ACR X WAS TRAVERSING THE MMN SECTOR AT FL220. 2 ARRS SAME COMPANY ACFT DESTINED TO CLR WOULD CROSS THE FLT PATH OF ACR X, BOTH AT FL230, FIRST ACR FOLLOWED BY ACR Y WAS GIVEN A CLRNC TO CROSS 15 SW DJB (DRYER VORTAC) AT 10000 FT. FIRST ACR DID NOT START HIS DSCNT TO 10000 SO A CLRNC WAS ISSUED FOR HIM TO REMAIN AT FL230 UNTIL HE PASSED ACR X. TFC WAS ISSUED TO ACR Y THAT ACR Y WAS AT FL220 AND APPROX 15 MI. FIRST ACR WAS NOT CLR OF THE J-RING AND I ISSUED A DSCNT CLRNC TO WHAT I THOUGHT WAS FIRST ACR. THE CLRNC THAT I GAVE WAS TO ACR Y WHO WAS IN CONFLICT WITH ACR X. AS A NOTE THE DSCNT CLRNC GIVEN TO ACR Y WAS GIVEN 6 SECONDS AFTER I ISSUED THE TFC AT FL220.
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.