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Manual controller failed to completely coordinate the descent of an small transport and less than standard separation occurred with an mlt in adjacent center's airspace.
| Attributes | |
| ACN | 101552 |
| Time | |
| Date | 198901 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bvt |
| State Reference | IN |
| Altitude | msl bound lower : 27500 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau artcc : zid |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors enroute airway : aid enroute airway : zau |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Medium Large Transport |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : developmental |
| Experience | controller radar : 1 |
| ASRS Report | 101552 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 101912 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure Inter Facility Coordination Failure |
Narrative:
Small transport X at FL290 southbound, mlt Y was swbnd at FL280 limited data block only. Small transport X requested FL250. Coordinated FL270 with sky king sector. Didn't recoordinate with indy north, and descended small transport X through mlt Y. Didn't see data block on mlt Y till they started flashing too late for evasive action and small transport X was past mlt Y at that time. Supplemental information from acn 101912: an small transport X was southbound and was supposed to be on the arwy. There was a strong west wind that day which was blowing the small transport X well east of course, into another sector's airspace. The small transport X was given a vector back toward the arwy and was pointed out to the other sector. The small transport X was at FL290, but they asked for lower. My manual man coordinated for lower with the receiving sector but not with the sector in whose airspace the small transport X now was. The manual man told me that I could descend to FL270 which I did. Suddenly the small transport X flashed C/a with a military flight at FL280 in the sector which had not been recoordinated with.
Original NASA ASRS Text
Title: MANUAL CTLR FAILED TO COMPLETELY COORDINATE THE DESCENT OF AN SMT AND LESS THAN STANDARD SEPARATION OCCURRED WITH AN MLT IN ADJACENT CENTER'S AIRSPACE.
Narrative: SMT X AT FL290 SBND, MLT Y WAS SWBND AT FL280 LIMITED DATA BLOCK ONLY. SMT X REQUESTED FL250. COORDINATED FL270 WITH SKY KING SECTOR. DIDN'T RECOORDINATE WITH INDY N, AND DSNDED SMT X THROUGH MLT Y. DIDN'T SEE DATA BLOCK ON MLT Y TILL THEY STARTED FLASHING TOO LATE FOR EVASIVE ACTION AND SMT X WAS PAST MLT Y AT THAT TIME. SUPPLEMENTAL INFO FROM ACN 101912: AN SMT X WAS SBND AND WAS SUPPOSED TO BE ON THE ARWY. THERE WAS A STRONG W WIND THAT DAY WHICH WAS BLOWING THE SMT X WELL E OF COURSE, INTO ANOTHER SECTOR'S AIRSPACE. THE SMT X WAS GIVEN A VECTOR BACK TOWARD THE ARWY AND WAS POINTED OUT TO THE OTHER SECTOR. THE SMT X WAS AT FL290, BUT THEY ASKED FOR LOWER. MY MANUAL MAN COORDINATED FOR LOWER WITH THE RECEIVING SECTOR BUT NOT WITH THE SECTOR IN WHOSE AIRSPACE THE SMT X NOW WAS. THE MANUAL MAN TOLD ME THAT I COULD DSND TO FL270 WHICH I DID. SUDDENLY THE SMT X FLASHED C/A WITH A MIL FLT AT FL280 IN THE SECTOR WHICH HAD NOT BEEN RECOORDINATED WITH.
Data retrieved from NASA's ASRS site as of August 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.