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ZHU ARTCC radar controller fails to hear incorrect readback from a B737 crew resulting in an operational error.
| Attributes | |
| ACN | 617504 |
| Time | |
| Date | 200405 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : idu.vortac |
| State Reference | TX |
| Altitude | msl bound lower : 11000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zhu.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 descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 13 controller time certified in position1 : 13 |
| ASRS Report | 617504 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 11000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was en route from iah to aus. Air carrier X was issued descent clearance to 17000 ft to stay 1000 ft above an en route DH8. Air carrier X read back 'discretion to eleven' and readback error was not heard. Air carrier X descended through the altitude of the DH8 and the conflict alert activated.
Original NASA ASRS Text
Title: ZHU ARTCC RADAR CTLR FAILS TO HEAR INCORRECT READBACK FROM A B737 CREW RESULTING IN AN OPERROR.
Narrative: ACR X WAS ENRTE FROM IAH TO AUS. ACR X WAS ISSUED DSCNT CLRNC TO 17000 FT TO STAY 1000 FT ABOVE AN ENRTE DH8. ACR X READ BACK 'DISCRETION TO ELEVEN' AND READBACK ERROR WAS NOT HEARD. ACR X DSNDED THROUGH THE ALT OF THE DH8 AND THE CONFLICT ALERT ACTIVATED.
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.