|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||airport : pdx|
|Altitude||agl bound lower : 0|
agl bound upper : 0
|Operator||common carrier : air carrier|
|Make Model Name||B737 Undifferentiated or Other Model|
|Operating Under FAR Part||Part 121|
|Flight Phase||climbout : takeoff|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 210|
flight time total : 17000
flight time type : 8000
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Qualification||pilot : instrument|
pilot : commercial
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||aircraft equipment other aircraft equipment : unspecified|
other flight crewa
|Resolutory Action||flight crew : rejected takeoff|
|Air Traffic Incident||other|
Pdx flight abc, XX00Z. We were cleared for takeoff with autothrottle armed and rejected takeoff engaged. Upon activating the takeoff/go around switches, the confign warning horn sounded. We accomplished a rapid check of the takeoff criteria and found everything in order. The takeoff was aborted at 55 KTS. We advised the tower and exited the runway. The flaps were recycled and the intransit and overhead displays were checked. Everything was normal. We were then again cleared for takeoff with the autothrottles armed and rejected takeoff engaged. This time as we armed the takeoff/go around switches, no aural warning was heard, but the autothrottle system failed with the green armed light still illuminated and the toggle switch remaining engaged in the armed position. We considered manual power setting, but it was a wet runway and we'd used up some available distance during the initial throttle advancement. We then elected to return to the gate to obtain a dpi for the autothrottles. XX25Z, we again pushed back and returned to the runway for takeoff. While manually advancing the throttles, the confign warning horn again sounded. We exited the runway and elected to return to the gate for a thorough confign warning check.
Original NASA ASRS Text
Title: A B737 ABORTS ITS TKOF 3 DIFFERENT TIMES AT PDX, OR.
Narrative: PDX FLT ABC, XX00Z. WE WERE CLRED FOR TKOF WITH AUTOTHROTTLE ARMED AND REJECTED TKOF ENGAGED. UPON ACTIVATING THE TKOF/GAR SWITCHES, THE CONFIGN WARNING HORN SOUNDED. WE ACCOMPLISHED A RAPID CHK OF THE TKOF CRITERIA AND FOUND EVERYTHING IN ORDER. THE TKOF WAS ABORTED AT 55 KTS. WE ADVISED THE TWR AND EXITED THE RWY. THE FLAPS WERE RECYCLED AND THE INTRANSIT AND OVERHEAD DISPLAYS WERE CHKED. EVERYTHING WAS NORMAL. WE WERE THEN AGAIN CLRED FOR TKOF WITH THE AUTOTHROTTLES ARMED AND REJECTED TKOF ENGAGED. THIS TIME AS WE ARMED THE TKOF/GAR SWITCHES, NO AURAL WARNING WAS HEARD, BUT THE AUTOTHROTTLE SYS FAILED WITH THE GREEN ARMED LIGHT STILL ILLUMINATED AND THE TOGGLE SWITCH REMAINING ENGAGED IN THE ARMED POS. WE CONSIDERED MANUAL PWR SETTING, BUT IT WAS A WET RWY AND WE'D USED UP SOME AVAILABLE DISTANCE DURING THE INITIAL THROTTLE ADVANCEMENT. WE THEN ELECTED TO RETURN TO THE GATE TO OBTAIN A DPI FOR THE AUTOTHROTTLES. XX25Z, WE AGAIN PUSHED BACK AND RETURNED TO THE RWY FOR TKOF. WHILE MANUALLY ADVANCING THE THROTTLES, THE CONFIGN WARNING HORN AGAIN SOUNDED. WE EXITED THE RWY AND ELECTED TO RETURN TO THE GATE FOR A THOROUGH CONFIGN WARNING CHK.
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.