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Large transport overshot his assigned altitude and had less than standard separation with an mlt descending to 12000. TCASII RA caused large transport to descend after the fact.
| Attributes | |
| ACN | 196526 |
| Time | |
| Date | 199112 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 11500 msl bound upper : 12200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : slc |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude descent other |
| Route In Use | departure other enroute airway : slc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Medium Large Transport |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| ASRS Report | 196526 |
| Person 2 | |
| Affiliation | government : faa |
| Function | oversight : supervisor oversight : coordinator |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
An air carrier large transport X climbing out of slc airport issued a climb to 11000 due to an mlt Y descending to 12000. The large transport X was not observed going through 11000 due to ARTS tag overlap for numerous departure and arrival traffic, ARTS tags not usable. When tags pried apart large transport X was at 11500 and mlt Y was at 12200. When I asked large transport X his altitude and assigned altitude he replied, assigned altitude 12000 descending to 11000 that his TCASII had just alarmed the traffic now at his 8 O'clock position. Slc TRACON supervisor is aware of the incident due to the aircraft he was the departure sector coordinator.
Original NASA ASRS Text
Title: LGT OVERSHOT HIS ASSIGNED ALT AND HAD LTSS WITH AN MLT DSNDING TO 12000. TCASII RA CAUSED LGT TO DSND AFTER THE FACT.
Narrative: AN ACR LGT X CLBING OUT OF SLC ARPT ISSUED A CLB TO 11000 DUE TO AN MLT Y DSNDING TO 12000. THE LGT X WAS NOT OBSERVED GOING THROUGH 11000 DUE TO ARTS TAG OVERLAP FOR NUMEROUS DEP AND ARR TFC, ARTS TAGS NOT USABLE. WHEN TAGS PRIED APART LGT X WAS AT 11500 AND MLT Y WAS AT 12200. WHEN I ASKED LGT X HIS ALT AND ASSIGNED ALT HE REPLIED, ASSIGNED ALT 12000 DSNDING TO 11000 THAT HIS TCASII HAD JUST ALARMED THE TFC NOW AT HIS 8 O'CLOCK POS. SLC TRACON SUPVR IS AWARE OF THE INCIDENT DUE TO THE ACFT HE WAS THE DEP SECTOR COORDINATOR.
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.