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ZID controller experienced operational error at FL280 when wrong aircraft accepted descent clearance and controller failed to recognize readback.
| Attributes | |
| ACN | 681509 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : ape.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 27000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Citation III VI VII |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar controller : military |
| Experience | controller military : 8 controller radar : 15 controller supervisory : 1 |
| ASRS Report | 681509 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X at FL280 was issued a descent to FL240. Air carrier Z at FL280 read back to clearance. Transmission was weak and garbled. Bad readback was not heard. Separation lost with aircraft Y at FL270. Air carrier Z was 300 mi from his destination and should not have descended without questioning the clearance. If air carrier Z had been TCAS equipped he would not have descended.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL280 WHEN WRONG ACFT ACCEPTED DSCNT CLRNC AND CTLR FAILED TO RECOGNIZE READBACK.
Narrative: ACR X AT FL280 WAS ISSUED A DSCNT TO FL240. ACR Z AT FL280 READ BACK TO CLRNC. XMISSION WAS WEAK AND GARBLED. BAD READBACK WAS NOT HEARD. SEPARATION LOST WITH ACFT Y AT FL270. ACR Z WAS 300 MI FROM HIS DEST AND SHOULD NOT HAVE DSNDED WITHOUT QUESTIONING THE CLRNC. IF ACR Z HAD BEEN TCAS EQUIPPED HE WOULD NOT HAVE DSNDED.
Data retrieved from NASA's ASRS site as of January 2009 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.