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Flight crew of an air carrier medium large transport descended from assigned intermediate altitude during arrival due to hearing and reading back clearance to a lower altitude.
| Attributes | |
| ACN | 433607 |
| Time | |
| Date | 199904 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : stl.airport |
| State Reference | MO |
| Altitude | msl bound lower : 4200 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a11.tracon tracon : t75.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : vfr |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 225 flight time total : 6000 flight time type : 900 |
| ASRS Report | 433607 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were level at 6000 ft. ATC (124.9) gave us a new altitude clearance to 4000 ft. Air carrier X flight read back 'air carrier X descend to 4000 ft.' as descending through 4200 ft, ATC on 124.9 said 'air carrier X you busted your altitude.' prior to descent, captain and first officer verified 4000 ft per air carrier X procedures. On ground, called and discussed the matter. The call was at XX03-XX12. Matter was resolved by phone call.
Original NASA ASRS Text
Title: FLC OF AN ACR MLG DSNDED FROM ASSIGNED INTERMEDIATE ALT DURING ARR DUE TO HEARING AND READING BACK CLRNC TO A LOWER ALT.
Narrative: WE WERE LEVEL AT 6000 FT. ATC (124.9) GAVE US A NEW ALT CLRNC TO 4000 FT. ACR X FLT READ BACK 'ACR X DSND TO 4000 FT.' AS DSNDING THROUGH 4200 FT, ATC ON 124.9 SAID 'ACR X YOU BUSTED YOUR ALT.' PRIOR TO DSCNT, CAPT AND FO VERIFIED 4000 FT PER ACR X PROCS. ON GND, CALLED AND DISCUSSED THE MATTER. THE CALL WAS AT XX03-XX12. MATTER WAS RESOLVED BY PHONE CALL.
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.