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B737-400 flight crew experiences failure of stabilizer trim at cruise. Hand fly aircraft to destination.
| Attributes | |
| ACN | 625751 |
| Time | |
| Date | 200407 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pdx.airport |
| State Reference | OR |
| Altitude | msl single value : 21000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 625751 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : eicas other flight crewa |
| Resolutory Action | none taken : anomaly accepted other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Aircraft |
Narrative:
During climb out of FL210 autoplt was engaged. Stabilizer out of trim annunciator flickered and I noticed an increase in forward speed. Buffet alert was displayed on FMC. Autoplt was disengaged. At the time I attempted to trim the aircraft via the electric trim. Nose up was inoperative but nose down did work (but I didn't need that). Stabilizer out of trim checklist was run and we manually re-trimmed the aircraft. Climb was continued. Maintenance control was contacted via operations radio. Maintenance control was informed as to what checklist we had run. They asked if it was inoperative on both a and B autoplt. We answered yes. They told us 'if you feel comfortable then continue on.' we did so. The captain elected to fly the aircraft and land in ZZZ. Maintenance replaced the trim motor and we continued to sea. This aircraft had had the trim motor replaced just 2 days prior to our flight. I am concerned that the aircraft may be burning up motors or the first motor was replaced with a bad one.
Original NASA ASRS Text
Title: B737-400 FLT CREW EXPERIENCES FAILURE OF STABILIZER TRIM AT CRUISE. HAND FLY ACFT TO DEST.
Narrative: DURING CLBOUT OF FL210 AUTOPLT WAS ENGAGED. STABILIZER OUT OF TRIM ANNUNCIATOR FLICKERED AND I NOTICED AN INCREASE IN FORWARD SPD. BUFFET ALERT WAS DISPLAYED ON FMC. AUTOPLT WAS DISENGAGED. AT THE TIME I ATTEMPTED TO TRIM THE ACFT VIA THE ELECTRIC TRIM. NOSE UP WAS INOP BUT NOSE DOWN DID WORK (BUT I DIDN'T NEED THAT). STABILIZER OUT OF TRIM CHKLIST WAS RUN AND WE MANUALLY RE-TRIMMED THE ACFT. CLB WAS CONTINUED. MAINT CTL WAS CONTACTED VIA OPS RADIO. MAINT CTL WAS INFORMED AS TO WHAT CHKLIST WE HAD RUN. THEY ASKED IF IT WAS INOP ON BOTH A AND B AUTOPLT. WE ANSWERED YES. THEY TOLD US 'IF YOU FEEL COMFORTABLE THEN CONTINUE ON.' WE DID SO. THE CAPT ELECTED TO FLY THE ACFT AND LAND IN ZZZ. MAINT REPLACED THE TRIM MOTOR AND WE CONTINUED TO SEA. THIS ACFT HAD HAD THE TRIM MOTOR REPLACED JUST 2 DAYS PRIOR TO OUR FLT. I AM CONCERNED THAT THE ACFT MAY BE BURNING UP MOTORS OR THE FIRST MOTOR WAS REPLACED WITH A BAD ONE.
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.