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ZDC controller misses B733 incorrect readback as he xfers the aircraft to rdu, the conflicts with a JS41.
| Attributes | |
| ACN | 510738 |
| Time | |
| Date | 200105 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : aldan |
| State Reference | NC |
| Altitude | msl bound lower : 10000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc tower : isp.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 41 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 |
| ASRS Report | 510738 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | airspace violation : entry altitude deviation : overshoot conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 10500 vertical : 0 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation Operational Error |
Narrative:
Aircraft X had a bad radio -- xmissions were garbled. The pilot also had an accent. I issued aircraft X a clearance to cross aldan intersection at 12000 ft and normal speed. The pilot read back what I thought was 12000 ft. The aircraft was switched to rdu approach. I noticed the aircraft descend below 11000 ft and called rdu approach. JS41 the aircraft came close to the aircraft.
Original NASA ASRS Text
Title: ZDC CTLR MISSES B733 INCORRECT READBACK AS HE XFERS THE ACFT TO RDU, THE CONFLICTS WITH A JS41.
Narrative: ACFT X HAD A BAD RADIO -- XMISSIONS WERE GARBLED. THE PLT ALSO HAD AN ACCENT. I ISSUED ACFT X A CLRNC TO CROSS ALDAN INTXN AT 12000 FT AND NORMAL SPD. THE PLT READ BACK WHAT I THOUGHT WAS 12000 FT. THE ACFT WAS SWITCHED TO RDU APCH. I NOTICED THE ACFT DSND BELOW 11000 FT AND CALLED RDU APCH. JS41 THE ACFT CAME CLOSE TO THE 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.