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Aircraft responded to descent clearance with a full readback. As aircraft leveled off, ARTCC told the flight crew they had descended to the wrong altitude.
| Attributes | |
| ACN | 431950 |
| Time | |
| Date | 199903 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : gpt.vortac |
| State Reference | MS |
| Altitude | msl single value : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 19400 flight time type : 6500 |
| ASRS Report | 431950 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ZHU cleared us to descend to 10000 ft, first officer read back 10000 ft. After leveloff at 10000 ft, center asked us what our altitude was and first officer replied 10000 ft. Center said we were cleared to 11000 ft. First officer replied, 'I read back 10000 ft.' center said, 'remain at 10000 ft and contact gpt approach control.' the center was busy at the time directing other aircraft. Either one of us missed a readback or we were given the wrong altitude initially.
Original NASA ASRS Text
Title: ACFT RESPONDED TO DSCNT CLRNC WITH A FULL READBACK. AS ACFT LEVELED OFF, ARTCC TOLD THE FLC THEY HAD DSNDED TO THE WRONG ALT.
Narrative: ZHU CLRED US TO DSND TO 10000 FT, FO READ BACK 10000 FT. AFTER LEVELOFF AT 10000 FT, CTR ASKED US WHAT OUR ALT WAS AND FO REPLIED 10000 FT. CTR SAID WE WERE CLRED TO 11000 FT. FO REPLIED, 'I READ BACK 10000 FT.' CTR SAID, 'REMAIN AT 10000 FT AND CONTACT GPT APCH CTL.' THE CTR WAS BUSY AT THE TIME DIRECTING OTHER ACFT. EITHER ONE OF US MISSED A READBACK OR WE WERE GIVEN THE WRONG ALT INITIALLY.
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.