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MD80 flight crew experiences autopilot auto trim failure during arrival causing two altitude deviations when the autopilot disengages due to stabilizer mistrim. Switching to autopilot number two solves the problem.
| Attributes | |
| ACN | 955170 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autopilot |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
Narrative:
On descent to 12;000 ft at level off; complete loss of #1 flight computer. Aircraft was in steep nose down trim [and] broke altitude by about 300 ft.
Original NASA ASRS Text
Title: MD80 flight crew experiences autopilot auto trim failure during arrival causing two altitude deviations when the autopilot disengages due to stabilizer mistrim. Switching to autopilot number two solves the problem.
Narrative: On descent to 12;000 FT at level off; complete loss of #1 flight computer. Aircraft was in steep nose down trim [and] broke altitude by about 300 FT.
Data retrieved from NASA's ASRS site as of April 2012 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.