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ZID controller misses readback from wrong aircraft which climbs to conflict with a level, en route aircraft.
| Attributes | |
| ACN | 539392 |
| Time | |
| Date | 200202 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : iiu.vortac |
| State Reference | KY |
| Altitude | msl bound lower : 27000 msl bound upper : 27500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.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 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 10 |
| ASRS Report | 539392 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 500 |
| Supplementary | |
| Problem Areas | Environmental Factor ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : zid.artcc |
Narrative:
Air carrier Y was level en route at FL280. Air carrier X was nashville departure climbing to FL250 from ZME for traffic at FL260. Clearing that traffic, air carrier X was climbed to FL270 to stay below air carrier Y at FL280. Subsequently, air carrier Z was descended to FL310. Air carrier X took the clearance to FL310 and read it back. Air carrier X passed below air carrier Y, just as air carrier X was climbing through FL270 and separation was lost. Air carrier Y asked about traffic 500 ft below. Radar contact was temporarily lost due to target jump and not regained until air carrier X was 5 mi clear of air carrier Y. Local distrs were a contributing factor to not hearing readback. Loud conversations were going on (non essential) between supervisor and 2 adjacent controllers.
Original NASA ASRS Text
Title: ZID CTLR MISSES READBACK FROM WRONG ACFT WHICH CLBS TO CONFLICT WITH A LEVEL, ENRTE ACFT.
Narrative: ACR Y WAS LEVEL ENRTE AT FL280. ACR X WAS NASHVILLE DEP CLBING TO FL250 FROM ZME FOR TFC AT FL260. CLRING THAT TFC, ACR X WAS CLBED TO FL270 TO STAY BELOW ACR Y AT FL280. SUBSEQUENTLY, ACR Z WAS DSNDED TO FL310. ACR X TOOK THE CLRNC TO FL310 AND READ IT BACK. ACR X PASSED BELOW ACR Y, JUST AS ACR X WAS CLBING THROUGH FL270 AND SEPARATION WAS LOST. ACR Y ASKED ABOUT TFC 500 FT BELOW. RADAR CONTACT WAS TEMPORARILY LOST DUE TO TARGET JUMP AND NOT REGAINED UNTIL ACR X WAS 5 MI CLR OF ACR Y. LCL DISTRS WERE A CONTRIBUTING FACTOR TO NOT HEARING READBACK. LOUD CONVERSATIONS WERE GOING ON (NON ESSENTIAL) BTWN SUPVR AND 2 ADJACENT CTLRS.
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.