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Flight crew of a B737 climbed above assigned cruising altitude due to autoplt altitude hold malfunction. They were alerted to their mistake when the ARTCC controller questioned their altitude.
| Attributes | |
| ACN | 433199 |
| Time | |
| Date | 199904 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : sqs.vortac |
| State Reference | MS |
| Altitude | msl bound lower : 30700 msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 120 flight time total : 10000 |
| ASRS Report | 433199 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 12000 flight time type : 900 |
| ASRS Report | 432670 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned airspace |
| Consequence | Other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Autoplt failed to hold selected cruise altitude. Climbed 300 ft. MCP annunciated green/normal, ie, there were no warning aural or visual. The altitude alert also did not indicate any deviation. ATC inquired about our altitude, the deviation was noted and corrected. Autoplt was written up.
Original NASA ASRS Text
Title: FLC OF A B737 CLBED ABOVE ASSIGNED CRUISING ALT DUE TO AUTOPLT ALT HOLD MALFUNCTION. THEY WERE ALERTED TO THEIR MISTAKE WHEN THE ARTCC CTLR QUESTIONED THEIR ALT.
Narrative: AUTOPLT FAILED TO HOLD SELECTED CRUISE ALT. CLBED 300 FT. MCP ANNUNCIATED GREEN/NORMAL, IE, THERE WERE NO WARNING AURAL OR VISUAL. THE ALT ALERT ALSO DID NOT INDICATE ANY DEV. ATC INQUIRED ABOUT OUR ALT, THE DEV WAS NOTED AND CORRECTED. AUTOPLT WAS WRITTEN UP.
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.