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B737-700 flight crew experiences abnormal trim wheel movements during climbout and elects to return after declaring an emergency and complying with QRH procedures. During the return a TCAS RA is received and complied with before an uneventful landing.
| Attributes | |
| ACN | 880604 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Conflict Airborne Conflict |
Narrative:
After takeoff and while hand flying on climbout we noticed the pitch trim moving in an abnormal fashion; in abrupt jerky movements. This continued to 10;000 feet and during stable unaccelerated flight. We were both uncomfortable with the unusual trim motion; so decided to run the checklist; contact maintenance; dispatch; and decided to return. Being a flight control issue and needing to land flaps 15 per the checklist we determined declaring an emergency was the correct course of action. During vectors as an emergency aircraft we were vectored into close proximity of a general aviation aircraft at 5;000 feet; thus receiving and complying with an RA. We landed uneventfully and parked at the gate.
Original NASA ASRS Text
Title: B737-700 flight crew experiences abnormal trim wheel movements during climbout and elects to return after declaring an emergency and complying with QRH procedures. During the return a TCAS RA is received and complied with before an uneventful landing.
Narrative: After takeoff and while hand flying on climbout we noticed the pitch trim moving in an abnormal fashion; in abrupt jerky movements. This continued to 10;000 feet and during stable unaccelerated flight. We were both uncomfortable with the unusual trim motion; so decided to run the checklist; contact Maintenance; Dispatch; and decided to return. Being a flight control issue and needing to land flaps 15 per the checklist we determined declaring an emergency was the correct course of action. During vectors as an emergency aircraft we were vectored into close proximity of a general aviation aircraft at 5;000 feet; thus receiving and complying with an RA. We landed uneventfully and parked at the gate.
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.