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Boeing 737 captain reported that they were unable to electrically trim the horizontal stabilizer using the 'pickle' switches or the autopilot.
| Attributes | |
| ACN | 1480356 |
| Time | |
| Date | 201709 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim Motor |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
During climb at about 9;000 ft; the hand flying first officer noticed that the electric trim stopped working. Wondering if the autopilot circuit would work; we found that the autopilot wouldn't auto trim. We got a block altitude nominally at 13;000 ft while we looked for an operator error. None could be found.the QRH directed a divert; so we notified ATC; arff (air rescue and fire fighting); and dispatch. I accomplished the QRH trim inoperative and appropriate normal checklists. Manual trim worked normally. I gave the number 1 flight attendant an [emergency] brief and notified the passengers about the problem and that safety vehicles would look us over.the first officer did a normal flaps 15 landing and we stopped clear of the runway for inspection and escort by arff. I asked the passengers to remain seated. We taxied to the gate with no other abnormalities. Upon gate arrival; maintenance met us and started trouble shooting. Initially; the electric trim wouldn't work. I don't know what was then changed; it didn't appear to be anything we did wrong; but the trim started working again.
Original NASA ASRS Text
Title: Boeing 737 Captain reported that they were unable to electrically trim the Horizontal Stabilizer using the 'pickle' switches or the Autopilot.
Narrative: During climb at about 9;000 FT; the hand flying First Officer noticed that the electric trim stopped working. Wondering if the autopilot circuit would work; we found that the autopilot wouldn't auto trim. We got a block altitude nominally at 13;000 FT while we looked for an operator error. None could be found.The QRH directed a divert; so we notified ATC; ARFF (Air Rescue and Fire Fighting); and dispatch. I accomplished the QRH trim inoperative and appropriate normal checklists. Manual trim worked normally. I gave the number 1 Flight Attendant an [emergency] brief and notified the passengers about the problem and that safety vehicles would look us over.The First Officer did a normal flaps 15 landing and we stopped clear of the runway for inspection and escort by ARFF. I asked the passengers to remain seated. We taxied to the gate with no other abnormalities. Upon gate arrival; maintenance met us and started trouble shooting. Initially; the electric trim wouldn't work. I don't know what was then changed; it didn't appear to be anything we did wrong; but the trim started working again.
Data retrieved from NASA's ASRS site 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.