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ARTCC trainee controller inadvertently descended a commuter jet through another commuter aircraft's climbing altitude with less than 5 mi separation.
| Attributes | |
| ACN | 542712 |
| Time | |
| Date | 200203 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : fwa.airport |
| State Reference | IN |
| Altitude | msl bound lower : 13500 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Experience | controller time certified in position1 : 15 controller time certified in position2 : 3 flight time total : 330 |
| ASRS Report | 542712 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : trainee |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : separated traffic |
| Miss Distance | horizontal : 24000 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Training was being conducted at the gsh sector, ZAU. Trainee climbed air carrier X, which was ok, but descended air carrier Y. I didn't hear him descend the air carrier Y, but saw it in the data block. I asked him if he descended the air carrier Y but did not wait for him to reply. I tried to stop the air carrier Y at 14000 ft and the air carrier X at 13000 ft. Air carrier Y wanted to question the descent, stating he had already been cleared to 11000 ft. Gave the clearance again, however, he had gone through the altitude and climbed back up.
Original NASA ASRS Text
Title: ARTCC TRAINEE CTLR INADVERTENTLY DSNDED A COMMUTER JET THROUGH ANOTHER COMMUTER ACFT'S CLBING ALT WITH LESS THAN 5 MI SEPARATION.
Narrative: TRAINING WAS BEING CONDUCTED AT THE GSH SECTOR, ZAU. TRAINEE CLBED ACR X, WHICH WAS OK, BUT DSNDED ACR Y. I DIDN'T HEAR HIM DSND THE ACR Y, BUT SAW IT IN THE DATA BLOCK. I ASKED HIM IF HE DSNDED THE ACR Y BUT DID NOT WAIT FOR HIM TO REPLY. I TRIED TO STOP THE ACR Y AT 14000 FT AND THE ACR X AT 13000 FT. ACR Y WANTED TO QUESTION THE DSCNT, STATING HE HAD ALREADY BEEN CLRED TO 11000 FT. GAVE THE CLRNC AGAIN, HOWEVER, HE HAD GONE THROUGH THE ALT AND CLBED BACK UP.
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.