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An air carrier light transport crew misunderstood its altitude clearance and descended below its assigned altitude. Error admitted. Altitude deviation.
| Attributes | |
| ACN | 342290 |
| Time | |
| Date | 199607 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : buj |
| State Reference | TX |
| Altitude | msl bound lower : 16500 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 9500 flight time type : 3200 |
| ASRS Report | 342290 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 3500 flight time type : 2300 |
| ASRS Report | 342686 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : became reoriented flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
ZFW cleared us down to 7000 ft. 7000 ft was read back. Passing approximately 16500 ft, center issued another clearance of 40 mi north at 11000 ft from buj. This seemed conflicting with our 7000 ft clearance. We clarified the altitude assignment previously issued. Ft worth then reported the previous assignment to be 17000 ft. The mistake was caught passing 16200 ft. No deviations for traffic were needed.
Original NASA ASRS Text
Title: AN ACR LTT CREW MISUNDERSTOOD ITS ALT CLRNC AND DSNDED BELOW ITS ASSIGNED ALT. ERROR ADMITTED. ALTDEV.
Narrative: ZFW CLRED US DOWN TO 7000 FT. 7000 FT WAS READ BACK. PASSING APPROX 16500 FT, CTR ISSUED ANOTHER CLRNC OF 40 MI N AT 11000 FT FROM BUJ. THIS SEEMED CONFLICTING WITH OUR 7000 FT CLRNC. WE CLARIFIED THE ALT ASSIGNMENT PREVIOUSLY ISSUED. FT WORTH THEN RPTED THE PREVIOUS ASSIGNMENT TO BE 17000 FT. THE MISTAKE WAS CAUGHT PASSING 16200 FT. NO DEVS FOR TFC WERE NEEDED.
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.