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An L1011 flight crew attempts a takeoff with a known stabilizer trim misindication. The takeoff is aborted at 20 KTS when the takeoff warning horn sounds off because of the improper stabilizer trim setting for takeoff.
| Attributes | |
| ACN | 413694 |
| Time | |
| Date | 199804 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tpa |
| State Reference | FL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011-1 100/200/250 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : takeoff ground other : taxi other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 230 flight time total : 12000 flight time type : 4000 |
| ASRS Report | 413694 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : rejected takeoff other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
The captain's elevator trim was erroneous compared to the surface position indicator, first officer's and normal revolutions from zero. It read from 4 to 12 units up at the takeoff range from the other indicators. It was decided to take off after discussion. On takeoff with throttles above 50%, the takeoff warning sounded and takeoff was aborted at less than 20 KTS. Returned to the gate for maintenance. Captain's trim wheel moved correctly but indicator plate was slipping. Fixed by maintenance and flight proceeded without incident.
Original NASA ASRS Text
Title: AN L1011 FLC ATTEMPTS A TKOF WITH A KNOWN STABILIZER TRIM MISINDICATION. THE TKOF IS ABORTED AT 20 KTS WHEN THE TKOF WARNING HORN SOUNDS OFF BECAUSE OF THE IMPROPER STABILIZER TRIM SETTING FOR TKOF.
Narrative: THE CAPT'S ELEVATOR TRIM WAS ERRONEOUS COMPARED TO THE SURFACE POS INDICATOR, FO'S AND NORMAL REVOLUTIONS FROM ZERO. IT READ FROM 4 TO 12 UNITS UP AT THE TKOF RANGE FROM THE OTHER INDICATORS. IT WAS DECIDED TO TAKE OFF AFTER DISCUSSION. ON TKOF WITH THROTTLES ABOVE 50%, THE TKOF WARNING SOUNDED AND TKOF WAS ABORTED AT LESS THAN 20 KTS. RETURNED TO THE GATE FOR MAINT. CAPT'S TRIM WHEEL MOVED CORRECTLY BUT INDICATOR PLATE WAS SLIPPING. FIXED BY MAINT AND FLT PROCEEDED WITHOUT INCIDENT.
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.