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ARTCC controller descended an light transport through the altitude of another without standard separation.
| Attributes | |
| ACN | 193127 |
| Time | |
| Date | 199110 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : gdm |
| State Reference | MA |
| Altitude | msl bound lower : 14600 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 193127 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| ASRS Report | 193208 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 20000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I attempted to descend an aircraft through the path of another aircraft. When I saw that the descent profile was not enough to maintain separation I turned the first aircraft. I then determined that this turn wouldn't be enough to maintain separation, I called the second aircraft involved. The second aircraft did not respond so I attempted to call again. I then called the first aircraft and learned that the pilot had been attempting to call me and was stepping on my xmissions to the second aircraft. Supplemental information from acn 193208. Light transport X lga .1. Merit hfd V229 gdm .1. Mht at 15000, so of hfd given direct gdm. Light transport Y plb .1. V130 orw V308 boros-CCC-isp at FL190. Light transport X was pointed out to ZBW sector 07 at 15000 descending to 11000 momentarily. Light transport Y also pointed out to ZBW sector 07 descending to 11000 and given descent. Large transport Y initial rate of descent observed to be 1500 FPM then increased slightly. Light transport Y with an air carrier (20 mit descending private) pointed out to ZBW sector 34. ZBW sector 34 approved point out. Air carrier took radar contact with light transport Y descending to 12000. Light transport Y issued amended altitude and given rv 20 degree left of course. Light transport X issued turn 50 degree left of course 3 times, turn was not acknowledged.
Original NASA ASRS Text
Title: ARTCC CTLR DSNDED AN LTT THROUGH THE ALT OF ANOTHER WITHOUT STANDARD SEPARATION.
Narrative: I ATTEMPTED TO DSND AN ACFT THROUGH THE PATH OF ANOTHER ACFT. WHEN I SAW THAT THE DSCNT PROFILE WAS NOT ENOUGH TO MAINTAIN SEPARATION I TURNED THE FIRST ACFT. I THEN DETERMINED THAT THIS TURN WOULDN'T BE ENOUGH TO MAINTAIN SEPARATION, I CALLED THE SECOND ACFT INVOLVED. THE SECOND ACFT DID NOT RESPOND SO I ATTEMPTED TO CALL AGAIN. I THEN CALLED THE FIRST ACFT AND LEARNED THAT THE PLT HAD BEEN ATTEMPTING TO CALL ME AND WAS STEPPING ON MY XMISSIONS TO THE SECOND ACFT. SUPPLEMENTAL INFO FROM ACN 193208. LTT X LGA .1. MERIT HFD V229 GDM .1. MHT AT 15000, SO OF HFD GIVEN DIRECT GDM. LTT Y PLB .1. V130 ORW V308 BOROS-CCC-ISP AT FL190. LTT X WAS POINTED OUT TO ZBW SECTOR 07 AT 15000 DSNDING TO 11000 MOMENTARILY. LTT Y ALSO POINTED OUT TO ZBW SECTOR 07 DSNDING TO 11000 AND GIVEN DSCNT. LGT Y INITIAL RATE OF DSCNT OBSERVED TO BE 1500 FPM THEN INCREASED SLIGHTLY. LTT Y WITH AN ACR (20 MIT DSNDING PVT) POINTED OUT TO ZBW SECTOR 34. ZBW SECTOR 34 APPROVED POINT OUT. ACR TOOK RADAR CONTACT WITH LTT Y DSNDING TO 12000. LTT Y ISSUED AMENDED ALT AND GIVEN RV 20 DEG L OF COURSE. LTT X ISSUED TURN 50 DEG L OF COURSE 3 TIMES, TURN WAS NOT ACKNOWLEDGED.
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.