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A system error, wherein an ARTCC radar controller reports a loss of traffic separation when a lear 31 was descended prematurely in the face of opposite direction DC10 traffic 50 mi northwest of bae, wi.
| Attributes | |
| ACN | 457360 |
| Time | |
| Date | 199912 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : bae.vortac |
| State Reference | WI |
| Altitude | msl bound lower : 38600 msl bound upper : 39000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 31 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 30 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter other non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance controller : separated traffic |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 19800 vertical : 1700 |
| Supplementary | |
| Problem Areas | ATC Human Performance Environmental Factor Weather |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
LR31 inbound to msp at FL390 required restr and flow to msp was 10 mi in trail at or below FL310. LR31 was told by ATC for maximum IAS for spacing. LR31 advise that he would do best he could since it was a little warm at FL390. Descended LR31 to FL350 not realizing that DC10 was traffic eastbound at FL370. Aircraft passed at 3.3 mi, 1600 ft until LR31 turned 20 degrees right and climbed to FL390. ZAU alert was 3.3 mi and 1700 ft.
Original NASA ASRS Text
Title: A SYS ERROR, WHEREIN AN ARTCC RADAR CTLR RPTS A LOSS OF TFC SEPARATION WHEN A LEAR 31 WAS DSNDED PREMATURELY IN THE FACE OF OPPOSITE DIRECTION DC10 TFC 50 MI NW OF BAE, WI.
Narrative: LR31 INBOUND TO MSP AT FL390 REQUIRED RESTR AND FLOW TO MSP WAS 10 MI IN TRAIL AT OR BELOW FL310. LR31 WAS TOLD BY ATC FOR MAX IAS FOR SPACING. LR31 ADVISE THAT HE WOULD DO BEST HE COULD SINCE IT WAS A LITTLE WARM AT FL390. DSNDED LR31 TO FL350 NOT REALIZING THAT DC10 WAS TFC EBOUND AT FL370. ACFT PASSED AT 3.3 MI, 1600 FT UNTIL LR31 TURNED 20 DEGS R AND CLBED TO FL390. ZAU ALERT WAS 3.3 MI AND 1700 FT.
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.