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B737 first officer reported an uncommanded autoplt pitch over. The crew had to exert considerable pressure before they could override the autoplt.
| Attributes | |
| ACN | 450131 |
| Time | |
| Date | 199909 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | msl single value : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : atp pilot : cfi pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 80 flight time total : 9000 flight time type : 200 |
| ASRS Report | 450131 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : regained aircraft control flight crew : returned to assigned airspace flight crew : overcame equipment problem flight crew : overrode automation |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During level flight at FL290, the autoplt made an uncommanded pitch over. Tried to override, but it would not at first. Pulled harder and finally overrode into control wheel steering pitch. Re-leveled at FL290. Unknown what caused the problem. Did fine the rest of the day.
Original NASA ASRS Text
Title: B737 FO RPTED AN UNCOMMANDED AUTOPLT PITCH OVER. THE CREW HAD TO EXERT CONSIDERABLE PRESSURE BEFORE THEY COULD OVERRIDE THE AUTOPLT.
Narrative: DURING LEVEL FLT AT FL290, THE AUTOPLT MADE AN UNCOMMANDED PITCH OVER. TRIED TO OVERRIDE, BUT IT WOULD NOT AT FIRST. PULLED HARDER AND FINALLY OVERRODE INTO CTL WHEEL STEERING PITCH. RE-LEVELED AT FL290. UNKNOWN WHAT CAUSED THE PROB. DID FINE THE REST OF THE DAY.
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.