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A B727-200 on 2 takeoff attempts experienced the takeoff warning horn caused by a flap position switch out of adjustment.
| Attributes | |
| ACN | 440368 |
| Time | |
| Date | 199906 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dtw.airport |
| State Reference | MI |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dtw.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer pilot : instrument pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 175 flight time total : 10000 flight time type : 1500 |
| ASRS Report | 440368 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 173 flight time total : 13500 flight time type : 5202 |
| ASRS Report | 440493 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : takeoff warning other flight crewa other flight crewb |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Advanced throttles to takeoff power and takeoff warning horn sounded. Takeoff was aborted below 80 KTS, cleared runway and followed company limitations procedures. Reconfigured aircraft flaps and trim settings, rechked speed brakes stowed and speed brake flap warning check. Increased power above 1.4 EPR and takeoff warning horn sounded again. Takeoff was prohibited and returned to gate for maintenance. Callback conversation with reporter revealed the following information: the reporter stated the cause of the takeoff warning horn sounding when throttles were advanced was a flap position switch. The reporter said maintenance adjusted the flap switch and takeoff warning horn checked ok.
Original NASA ASRS Text
Title: A B727-200 ON 2 TKOF ATTEMPTS EXPERIENCED THE TKOF WARNING HORN CAUSED BY A FLAP POS SWITCH OUT OF ADJUSTMENT.
Narrative: ADVANCED THROTTLES TO TKOF PWR AND TKOF WARNING HORN SOUNDED. TKOF WAS ABORTED BELOW 80 KTS, CLRED RWY AND FOLLOWED COMPANY LIMITATIONS PROCS. RECONFIGURED ACFT FLAPS AND TRIM SETTINGS, RECHKED SPD BRAKES STOWED AND SPD BRAKE FLAP WARNING CHK. INCREASED PWR ABOVE 1.4 EPR AND TKOF WARNING HORN SOUNDED AGAIN. TKOF WAS PROHIBITED AND RETURNED TO GATE FOR MAINT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE TKOF WARNING HORN SOUNDING WHEN THROTTLES WERE ADVANCED WAS A FLAP POS SWITCH. THE RPTR SAID MAINT ADJUSTED THE FLAP SWITCH AND TKOF WARNING HORN CHKED OK.
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.