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A B737-500 on takeoff at 80 KTS got takeoff warning horn continued takeoff due to before takeoff checklist complete. Speed brakes previously deferred as inoperative per MEL.
| Attributes | |
| ACN | 706398 |
| Time | |
| Date | 200608 |
| Place | |
| Locale Reference | airport : okc.airport |
| State Reference | OK |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| 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 |
| Experience | flight time last 90 days : 200 flight time total : 4600 flight time type : 1618 |
| ASRS Report | 706398 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 270 flight time total : 12000 flight time type : 315 |
| ASRS Report | 706397 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : takeoff warning horn other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft Chart Or Publication |
| Primary Problem | Aircraft |
Narrative:
Aircraft had properly deferred automatic-spoiler. Complied with MEL; ie; circuit breaker pulled; spoiler checked full forward/down prior to takeoff; takeoff and landing considerations made. Takeoff warning horn sounded at 80 KTS. Continued takeoff due to proper before takeoff checklist completion; ie; takeoff confign. Confirmed; and assumption that takeoff warning horn be associated with automatic-spoiler inoperative. Callback conversation with reporter from acn 706398 revealed the following information: the reporter stated that the speed brake handle was positioned full forward but believes it was not down in the detent. The warning horn was written up going into the next station where it was checked per the maintenance manual and found ok. Callback conversation with reporter from acn 706397 revealed the following information: the before takeoff checklist was accomplished and all items were checked and found were in the correct position. The speed brake handle was full forward and down in the detent. The warning system was written up going into the next station. The MEL procedures were correctly followed for deferral of the automatic speed brake system. Maintenance checked the takeoff warning system and found ok for service.
Original NASA ASRS Text
Title: A B737-500 ON TKOF AT 80 KTS GOT TKOF WARNING HORN CONTINUED TKOF DUE TO BEFORE TKOF CHKLIST COMPLETE. SPD BRAKES PREVIOUSLY DEFERRED AS INOP PER MEL.
Narrative: ACFT HAD PROPERLY DEFERRED AUTO-SPOILER. COMPLIED WITH MEL; IE; CIRCUIT BREAKER PULLED; SPOILER CHKED FULL FORWARD/DOWN PRIOR TO TKOF; TKOF AND LNDG CONSIDERATIONS MADE. TKOF WARNING HORN SOUNDED AT 80 KTS. CONTINUED TKOF DUE TO PROPER BEFORE TKOF CHKLIST COMPLETION; IE; TKOF CONFIGN. CONFIRMED; AND ASSUMPTION THAT TKOF WARNING HORN BE ASSOCIATED WITH AUTO-SPOILER INOP. CALLBACK CONVERSATION WITH RPTR FROM ACN 706398 REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE SPD BRAKE HANDLE WAS POSITIONED FULL FORWARD BUT BELIEVES IT WAS NOT DOWN IN THE DETENT. THE WARNING HORN WAS WRITTEN UP GOING INTO THE NEXT STATION WHERE IT WAS CHKED PER THE MAINT MANUAL AND FOUND OK. CALLBACK CONVERSATION WITH RPTR FROM ACN 706397 REVEALED THE FOLLOWING INFO: THE BEFORE TKOF CHKLIST WAS ACCOMPLISHED AND ALL ITEMS WERE CHKED AND FOUND WERE IN THE CORRECT POS. THE SPD BRAKE HANDLE WAS FULL FORWARD AND DOWN IN THE DETENT. THE WARNING SYS WAS WRITTEN UP GOING INTO THE NEXT STATION. THE MEL PROCS WERE CORRECTLY FOLLOWED FOR DEFERRAL OF THE AUTO SPD BRAKE SYS. MAINT CHKED THE TKOF WARNING SYS AND FOUND OK FOR SVC.
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.