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An air carrier B757 flight crew descended below their assigned altitude when they heard and read back 10000 ft instead of 11000 ft as the clearance altitude.
| Attributes | |
| ACN | 387650 |
| Time | |
| Date | 199712 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 6500 |
| ASRS Report | 387650 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approach gave clearance off macy SID to fly 200 degrees, speed 210 KTS, descend from 14000 ft to 10000 ft. Clearance was read back. Shortly later, a turn was given to 270 degrees, then approach called to say 'stop descent, maintain 11000 ft.' aircraft was at 10600 ft. Descent was stopped by 10500 ft and aircraft was brought back to 11000 ft. Approach then informed us that we were only cleared to 11000 ft.
Original NASA ASRS Text
Title: AN ACR B757 FLC DSNDED BELOW THEIR ASSIGNED ALT WHEN THEY HEARD AND READ BACK 10000 FT INSTEAD OF 11000 FT AS THE CLRNC ALT.
Narrative: APCH GAVE CLRNC OFF MACY SID TO FLY 200 DEGS, SPD 210 KTS, DSND FROM 14000 FT TO 10000 FT. CLRNC WAS READ BACK. SHORTLY LATER, A TURN WAS GIVEN TO 270 DEGS, THEN APCH CALLED TO SAY 'STOP DSCNT, MAINTAIN 11000 FT.' ACFT WAS AT 10600 FT. DSCNT WAS STOPPED BY 10500 FT AND ACFT WAS BROUGHT BACK TO 11000 FT. APCH THEN INFORMED US THAT WE WERE ONLY CLRED TO 11000 FT.
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.