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Wrong aircraft acknowledges descent clearance, and ZAU developmental and instructor miss covered transmission. Readback questioned by planned aircraft.
| Attributes | |
| ACN | 513236 |
| Time | |
| Date | 200105 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jvl.airport |
| State Reference | WI |
| Altitude | agl single value : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| 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 : developmental |
| Experience | controller radar : 20 |
| ASRS Report | 513236 |
| Person 2 | |
| Affiliation | government : faa |
| Function | instruction : trainee |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other other : conflict alert |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 10800 vertical : 400 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was training a developmental during a somewhat complicated inbound ord problem. Clearance was given to an air carrier X jet to descend to 13000 ft. An aircraft (air carrier Y) with similar call sign took clearance and descended into an aircraft below. Readback from correct aircraft was covered by acknowledgement from incorrect aircraft.
Original NASA ASRS Text
Title: WRONG ACFT ACKNOWLEDGES DSCNT CLRNC, AND ZAU DEVELOPMENTAL AND INSTRUCTOR MISS COVERED XMISSION. READBACK QUESTIONED BY PLANNED ACFT.
Narrative: I WAS TRAINING A DEVELOPMENTAL DURING A SOMEWHAT COMPLICATED INBOUND ORD PROB. CLRNC WAS GIVEN TO AN ACR X JET TO DSND TO 13000 FT. AN ACFT (ACR Y) WITH SIMILAR CALL SIGN TOOK CLRNC AND DSNDED INTO AN ACFT BELOW. READBACK FROM CORRECT ACFT WAS COVERED BY ACKNOWLEDGEMENT FROM INCORRECT ACFT.
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.