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ZID controller transposes air carrier call signs, misses an incorrect call sign readback, resulting in a loss of separation between a descending B737-500 and an en route level carj.
| Attributes | |
| ACN | 586501 |
| Time | |
| Date | 200306 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : azq.vortac |
| State Reference | KY |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 5 controller military : 9 controller radar : 12 |
| ASRS Report | 586501 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 1400 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
3 same company B737 aircraft on frequency going to bna with similar call signs. I turned air carrier bcde, but said air carrier bcdd and air carrier abcd answered. Air carrier abcd turned into traffic (air carrier west) that was already on a vector to go behind air carrier abcd. Additional vectors were given to air carrier west and air carrier abcd. Separation was lost. I noticed the history on air carrier abcd turning left. Wrong aircraft answered the turn.
Original NASA ASRS Text
Title: ZID CTLR TRANSPOSES ACR CALL SIGNS, MISSES AN INCORRECT CALL SIGN READBACK, RESULTING IN A LOSS OF SEPARATION BTWN A DSNDING B737-500 AND AN ENRTE LEVEL CARJ.
Narrative: 3 SAME COMPANY B737 ACFT ON FREQ GOING TO BNA WITH SIMILAR CALL SIGNS. I TURNED ACR BCDE, BUT SAID ACR BCDD AND ACR ABCD ANSWERED. ACR ABCD TURNED INTO TFC (ACR W) THAT WAS ALREADY ON A VECTOR TO GO BEHIND ACR ABCD. ADDITIONAL VECTORS WERE GIVEN TO ACR W AND ACR ABCD. SEPARATION WAS LOST. I NOTICED THE HISTORY ON ACR ABCD TURNING L. WRONG ACFT ANSWERED THE TURN.
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.