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A descending B757-200 flight crew experiences a runaway nose down trim when the captain started to deploy the speed brakes. Checklist use overcame the temporary loss of aircraft control.
| Attributes | |
| ACN | 425273 |
| Time | |
| Date | 199901 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rsw |
| State Reference | FL |
| Altitude | msl bound lower : 18000 msl bound upper : 18000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 425273 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Deeds intersection, descending through FL180 in flight level change with autoplt engaged. While lifting speed brake handle out of the detent, experienced a nose down stabilizer trim runaway. Accomplished immediate action items and runaway stabilizer trim checklist. Stabilizer trim operation normal for the remainder of the flight.
Original NASA ASRS Text
Title: A DSNDING B757-200 FLC EXPERIENCES A RUNAWAY NOSE DOWN TRIM WHEN THE CAPT STARTED TO DEPLOY THE SPD BRAKES. CHKLIST USE OVERCAME THE TEMPORARY LOSS OF ACFT CTL.
Narrative: DEEDS INTXN, DSNDING THROUGH FL180 IN FLT LEVEL CHANGE WITH AUTOPLT ENGAGED. WHILE LIFTING SPD BRAKE HANDLE OUT OF THE DETENT, EXPERIENCED A NOSE DOWN STABILIZER TRIM RUNAWAY. ACCOMPLISHED IMMEDIATE ACTION ITEMS AND RUNAWAY STABILIZER TRIM CHKLIST. STABILIZER TRIM OP NORMAL FOR THE REMAINDER OF THE FLT.
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.