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Captain of a B737-200 rejected takeoff due to takeoff warning horn during initial takeoff roll resulting in aircraft returned to the gate and incident written up in the aircraft log. Captain is concerned that the first officer's write-up may have been misleading to the point that others may believe that the elevator trim setting may have been incorrect causing the warning.
| Attributes | |
| ACN | 393910 |
| Time | |
| Date | 199802 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 135 flight time total : 8558 flight time type : 1360 |
| ASRS Report | 393910 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
I am unsure if this event constitutes a rejected takeoff, however during initial spool-up the takeoff warning horn sounded under normal conditions, ie, flaps 5 degrees -- green led light, speed brake -- done detent, stabilizer trim -- 4.4 (green band). The roll never reached 25 KTS, and have taxied faster than this when clear of runway. First officer actuated stabilizer trim wheel 1/2 to 3/4 of turn aft (nose up). Throttles moved forward, but EPR 1.25 EPR. Aircraft returned to gate and wrote up takeoff warning horn. First officer made brief announcement. Deduced later that horn responds to EPR, not position making maintenance write-up sketchy, and also making it sound like trim was out of green band. It was not.
Original NASA ASRS Text
Title: CAPT OF A B737-200 REJECTED TKOF DUE TO TKOF WARNING HORN DURING INITIAL TKOF ROLL RESULTING IN ACFT RETURNED TO THE GATE AND INCIDENT WRITTEN UP IN THE ACFT LOG. CAPT IS CONCERNED THAT THE FO'S WRITE-UP MAY HAVE BEEN MISLEADING TO THE POINT THAT OTHERS MAY BELIEVE THAT THE ELEVATOR TRIM SETTING MAY HAVE BEEN INCORRECT CAUSING THE WARNING.
Narrative: I AM UNSURE IF THIS EVENT CONSTITUTES A REJECTED TKOF, HOWEVER DURING INITIAL SPOOL-UP THE TKOF WARNING HORN SOUNDED UNDER NORMAL CONDITIONS, IE, FLAPS 5 DEGS -- GREEN LED LIGHT, SPD BRAKE -- DONE DETENT, STABILIZER TRIM -- 4.4 (GREEN BAND). THE ROLL NEVER REACHED 25 KTS, AND HAVE TAXIED FASTER THAN THIS WHEN CLR OF RWY. FO ACTUATED STABILIZER TRIM WHEEL 1/2 TO 3/4 OF TURN AFT (NOSE UP). THROTTLES MOVED FORWARD, BUT EPR 1.25 EPR. ACFT RETURNED TO GATE AND WROTE UP TKOF WARNING HORN. FO MADE BRIEF ANNOUNCEMENT. DEDUCED LATER THAT HORN RESPONDS TO EPR, NOT POS MAKING MAINT WRITE-UP SKETCHY, AND ALSO MAKING IT SOUND LIKE TRIM WAS OUT OF GREEN BAND. IT WAS NOT.
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.