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A B737-300's takeoff warning horn sounded causing a rejected takeoff. A slight trim change was made to a tail heavy aircraft that silenced the horn.
| Attributes | |
| ACN | 714427 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time total : 215 |
| ASRS Report | 714427 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : tkof warning horn |
| Supplementary | |
| Problem Areas | Company Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Set the trim per the opc to 5.2 units. Arrow was within the green band. Did the throttle burst and no horn. Taxiing onto runway for departure I made a small adjustment to the trim (short bump only) then was cleared for takeoff. Warning horn sounded and the takeoff was rejected. Checklists were accomplished and we reviewed the reasons a horn would sound. The trim was still in the green and horn sounded. Readjusted the trim even more to the lower side 5.0 to 5.1 and that silenced the horn. Subsequent takeoff was normal and the aircraft was quite tail heavy and it didn't take much effort to raise the nose.
Original NASA ASRS Text
Title: A B737-300'S TKOF WARNING HORN SOUNDED CAUSING A REJECTED TKOF. A SLIGHT TRIM CHANGE WAS MADE TO A TAIL HVY ACFT THAT SILENCED THE HORN.
Narrative: SET THE TRIM PER THE OPC TO 5.2 UNITS. ARROW WAS WITHIN THE GREEN BAND. DID THE THROTTLE BURST AND NO HORN. TAXIING ONTO RWY FOR DEP I MADE A SMALL ADJUSTMENT TO THE TRIM (SHORT BUMP ONLY) THEN WAS CLRED FOR TKOF. WARNING HORN SOUNDED AND THE TKOF WAS REJECTED. CHKLISTS WERE ACCOMPLISHED AND WE REVIEWED THE REASONS A HORN WOULD SOUND. THE TRIM WAS STILL IN THE GREEN AND HORN SOUNDED. READJUSTED THE TRIM EVEN MORE TO THE LOWER SIDE 5.0 TO 5.1 AND THAT SILENCED THE HORN. SUBSEQUENT TKOF WAS NORMAL AND THE ACFT WAS QUITE TAIL HVY AND IT DIDN'T TAKE MUCH EFFORT TO RAISE THE NOSE.
Data retrieved from NASA's ASRS site as of January 2009 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.