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ATC flight crew miscom. After clearing flight crew to 11000 ft, flight crew heard 10000 ft and read it back. But, the readback was blocked and approach controller didn't hear it. Controller intervened when aircraft was at 10500 ft and clarified their altitude clearance as 11000 ft.
| Attributes | |
| ACN | 339790 |
| Time | |
| Date | 199606 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl tower : tul |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : commercial pilot : flight engineer |
| ASRS Report | 339790 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 720 flight time type : 700 |
| ASRS Report | 339786 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
On descent into atlanta, was given clearance from 11000 ft to descend to 10000 ft. Acknowledged clearance. At 10500 ft approach control called and said assigned altitude was 11000 ft. Returned aft to 11000 ft, after informing approach control they had cleared us to 10000 ft. Approach control later acknowledged our readback had been partially blocked by another aircraft. Pilot proceeded to atl with no further problems.
Original NASA ASRS Text
Title: ATC FLC MISCOM. AFTER CLRING FLC TO 11000 FT, FLC HEARD 10000 FT AND READ IT BACK. BUT, THE READBACK WAS BLOCKED AND APCH CTLR DIDN'T HEAR IT. CTLR INTERVENED WHEN ACFT WAS AT 10500 FT AND CLARIFIED THEIR ALT CLRNC AS 11000 FT.
Narrative: ON DSCNT INTO ATLANTA, WAS GIVEN CLRNC FROM 11000 FT TO DSND TO 10000 FT. ACKNOWLEDGED CLRNC. AT 10500 FT APCH CTL CALLED AND SAID ASSIGNED ALT WAS 11000 FT. RETURNED AFT TO 11000 FT, AFTER INFORMING APCH CTL THEY HAD CLRED US TO 10000 FT. APCH CTL LATER ACKNOWLEDGED OUR READBACK HAD BEEN PARTIALLY BLOCKED BY ANOTHER ACFT. PLT PROCEEDED TO ATL WITH NO FURTHER PROBS.
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.