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A MD80 crew reset the stabilizer trim during taxi because the takeoff performance changed but failed to reset the cg tab to match. The takeoff warning horn sounded as a result of the mismatch causing the crew to reject the takeoff at about 20 KTS.
| Attributes | |
| ACN | 850349 |
| Time | |
| Date | 200908 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ORD.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Horizontal Stabilizer Trim |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Deviation - Procedural Weight And Balance |
Narrative:
We did a low speed abort; less than 20 KTS; due to an aural stabilizer trim warning. After clearing runway we realized after getting updated performance data for a heavier takeoff weight and maximum power takeoff settings we failed to properly reset the cg setting after properly setting the stabilizer trim. This caused the green cg tab and white trim tab to be out of sync and caused the aural warning to sound. Obviously we both missed it during our second takeoff data and bugs check.
Original NASA ASRS Text
Title: A MD80 crew reset the stabilizer trim during taxi because the takeoff performance changed but failed to reset the CG tab to match. The takeoff warning horn sounded as a result of the mismatch causing the crew to reject the takeoff at about 20 KTS.
Narrative: We did a low speed abort; less than 20 KTS; due to an aural stabilizer trim warning. After clearing runway we realized after getting updated performance data for a heavier takeoff weight and maximum power takeoff settings we failed to properly reset the CG setting after properly setting the stabilizer trim. This caused the green CG tab and white trim tab to be out of sync and caused the aural warning to sound. Obviously we both missed it during our second takeoff data and bugs check.
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.