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A departure, climbing, air carrier jet overshoots its assigned departure altitude when the captain disconnects the autoplt, thinking that his airspeed increase during the leveloff was an autoplt problem, not an inoperative autothrust. 40 mi west of atl, GA.
| Attributes | |
| ACN | 483700 |
| Time | |
| Date | 200008 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | msl bound lower : 14000 msl bound upper : 14250 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 1000 |
| ASRS Report | 483700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 200 |
| ASRS Report | 483701 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
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.
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.