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A B737-700 crew inadvertently engage the autoplt during taxi out and discovered the error on the runway at the stabilizer trim ran up and down uncommanded.
| Attributes | |
| ACN | 689206 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : smf.airport |
| State Reference | CA |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 689209 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : company policies non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : elevator trim other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : became reoriented flight crew : exited adverse environment flight crew : regained aircraft control flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We had been cleared for takeoff at smf on runway 16L. When we taxied out on the runway; we noticed the elevator trim was running up and then back down 3-4 degrees uncommanded. We did a 180 degree turn on the runway and taxied back to the hold short to troubleshoot. The autoplt had been engaged inadvertently on the taxi out. When and where we don't know. We disengaged the autoplt; re-ran the checklist; everything appeared normal and we told tower we were ready for takeoff. We took off and flew without further incident.
Original NASA ASRS Text
Title: A B737-700 CREW INADVERTENTLY ENGAGE THE AUTOPLT DURING TAXI OUT AND DISCOVERED THE ERROR ON THE RWY AT THE STABILIZER TRIM RAN UP AND DOWN UNCOMMANDED.
Narrative: WE HAD BEEN CLRED FOR TKOF AT SMF ON RWY 16L. WHEN WE TAXIED OUT ON THE RWY; WE NOTICED THE ELEVATOR TRIM WAS RUNNING UP AND THEN BACK DOWN 3-4 DEGS UNCOMMANDED. WE DID A 180 DEG TURN ON THE RWY AND TAXIED BACK TO THE HOLD SHORT TO TROUBLESHOOT. THE AUTOPLT HAD BEEN ENGAGED INADVERTENTLY ON THE TAXI OUT. WHEN AND WHERE WE DON'T KNOW. WE DISENGAGED THE AUTOPLT; RE-RAN THE CHKLIST; EVERYTHING APPEARED NORMAL AND WE TOLD TWR WE WERE READY FOR TKOF. WE TOOK OFF AND FLEW WITHOUT FURTHER INCIDENT.
Data retrieved from NASA's ASRS site as of January 2009 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.