Narrative:

We departed atl with inoperative autothrottles. We had an altitude hold-down at 14000 ft. I mistook the increase in airspeed for an autoplt malfunction, rather than a gradual leveloff from a high rate of climb. I disconnected the autoplt and the aircraft flew 200-250 ft above 14000 ft before I could correct back to 14000 ft. Contributing factors were the abnormal aircraft system with no autothrottle and fatigue from the late hour. We were talking to atlanta on 134.95.

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Original NASA ASRS Text

Title: A DEP, CLBING, ACR JET OVERSHOOTS ITS ASSIGNED DEP ALT WHEN THE CAPT DISCONNECTS THE AUTOPLT, THINKING THAT HIS AIRSPD INCREASE DURING THE LEVELOFF WAS AN AUTOPLT PROB, NOT AN INOP AUTOTHRUST. 40 MI W OF ATL, GA.

Narrative: WE DEPARTED ATL WITH INOP AUTOTHROTTLES. WE HAD AN ALT HOLD-DOWN AT 14000 FT. I MISTOOK THE INCREASE IN AIRSPD FOR AN AUTOPLT MALFUNCTION, RATHER THAN A GRADUAL LEVELOFF FROM A HIGH RATE OF CLB. I DISCONNECTED THE AUTOPLT AND THE ACFT FLEW 200-250 FT ABOVE 14000 FT BEFORE I COULD CORRECT BACK TO 14000 FT. CONTRIBUTING FACTORS WERE THE ABNORMAL ACFT SYS WITH NO AUTOTHROTTLE AND FATIGUE FROM THE LATE HR. WE WERE TALKING TO ATLANTA ON 134.95.

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.