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Air carrier Y had less than standard separation from air carrier X. Same altitude assigned. System error.
| Attributes | |
| ACN | 212998 |
| Time | |
| Date | 199206 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mkc |
| State Reference | MO |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc artcc : zse |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 8 |
| ASRS Report | 212998 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : weather non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
WX impacting flts east of kansas city caused a last min holding situation in the kansas city area. Numerous actions were taken to control the situation, but the impact of this unexpected development created a bunchup which resulted in a loss of separation. Callback conversation with reporter revealed the following information. Reporter is an fpl with 8 yrs radar experience. Reporter stated adjoining sector had shut him off with no warning because of WX. 22 aircraft in sector at time. Air carrier X was turned and air carrier Y was in trail. Altitude was FL330. Air carrier X slowed because of headwind. Air carrier Y was turned early to stay in trail. Air carrier Y lost separation same altitude 4 mi. Conflict alert did not activate.
Original NASA ASRS Text
Title: ACR Y HAD LTSS FROM ACR X. SAME ALT ASSIGNED. SYS ERROR.
Narrative: WX IMPACTING FLTS E OF KANSAS CITY CAUSED A LAST MIN HOLDING SITUATION IN THE KANSAS CITY AREA. NUMEROUS ACTIONS WERE TAKEN TO CTL THE SITUATION, BUT THE IMPACT OF THIS UNEXPECTED DEVELOPMENT CREATED A BUNCHUP WHICH RESULTED IN A LOSS OF SEPARATION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR IS AN FPL WITH 8 YRS RADAR EXPERIENCE. RPTR STATED ADJOINING SECTOR HAD SHUT HIM OFF WITH NO WARNING BECAUSE OF WX. 22 ACFT IN SECTOR AT TIME. ACR X WAS TURNED AND ACR Y WAS IN TRAIL. ALT WAS FL330. ACR X SLOWED BECAUSE OF HEADWIND. ACR Y WAS TURNED EARLY TO STAY IN TRAIL. ACR Y LOST SEPARATION SAME ALT 4 MI. CONFLICT ALERT DID NOT ACTIVATE.
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.