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A B737-700 captain reported losing stabilizer trim in descent. An emergency was declared and a normal landing followed.
| Attributes | |
| ACN | 937537 |
| Time | |
| Date | 201102 |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Speed All Types |
Narrative:
During descent out of FL270 the autopilot disengaged and aircraft pitched up forcefully. First officer took control and attempted to trim the aircraft (pitch down) from his flight control wheel. No trim response from either control-wheel pitch up or down. Visually confirmed with no rotation of trim wheel. [Made] second attempt to trim aircraft with electric trim switches with no response. Ran the stabilizer electric trim inoperative checklist from the QRH. We had manual trim control of the aircraft by using the flip-out handles on trim wheel. Declared an emergency with ATC and planned a flaps 15 landing. Landed without further incident and taxied to the gate. I communicated with each flight attendant and debriefed them of what had occurred along with a brief system explanation of the aircraft. I completed the maintenance log book write-up. Called maintenance control to de-brief them of the write-up to answer any questions about the incident. During descent ATC issued several crossing altitudes and speed restrictions that we were unable to comply with due to high workload. We gave ATC a brief explanation ('unable to trim aircraft electrically along with stabilizer problems').
Original NASA ASRS Text
Title: A B737-700 Captain reported losing stabilizer trim in descent. An emergency was declared and a normal landing followed.
Narrative: During descent out of FL270 the autopilot disengaged and aircraft pitched up forcefully. First Officer took control and attempted to trim the aircraft (pitch down) from his flight control wheel. No trim response from either control-wheel pitch up or down. Visually confirmed with no rotation of trim wheel. [Made] second attempt to trim aircraft with electric trim switches with no response. Ran the STABILIZER ELECTRIC TRIM INOPERATIVE checklist from the QRH. We had manual trim control of the aircraft by using the flip-out handles on trim wheel. Declared an emergency with ATC and planned a flaps 15 landing. Landed without further incident and taxied to the gate. I communicated with each Flight Attendant and debriefed them of what had occurred along with a brief system explanation of the aircraft. I completed the maintenance log book write-up. Called Maintenance Control to de-brief them of the write-up to answer any questions about the incident. During descent ATC issued several crossing altitudes and speed restrictions that we were unable to comply with due to high workload. We gave ATC a brief explanation ('unable to trim aircraft electrically along with stabilizer problems').
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.