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ERJ170 first officer reports two rejected takeoffs due to flight director and autothrottle disengagement during takeoff roll at 40 KTS. No aircraft anomalies can be discerned and the problem is thought to be related to the very strong gusting winds; a third attempt was made during without difficulty.
| Attributes | |
| ACN | 991390 |
| Time | |
| Date | 201201 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence |
Narrative:
Aircraft disengaged flight director modes and disengaged autothrottles on takeoff roll around 40 KTS; got master caution message. We aborted takeoff. Ran checklists and everything was compliant for a second takeoff. [We] got clearance for takeoff from tower. Again on the takeoff roll around 40 KTS; the aircraft disengaged the flight director modes; disengaged the autothrottles; and got a master caution message. We aborted takeoff. Ran checklists. At the time; outside temperature was -3 with snow; blowing snow; winds at 140 [degree] 35 gusting to 45. When we stopped with the parking brake on to run checklists; we noticed that the airspeed indicator was indicating 10 to as high at 60 KTS due to the strong wind gusts. We felt the wind gusts were giving the airplane unstable indications; and waited for a calm spot between gusts to try one last takeoff. [We] were able to take off on the third try without any abnormalities.
Original NASA ASRS Text
Title: ERJ170 First Officer reports two rejected takeoffs due to flight director and autothrottle disengagement during takeoff roll at 40 KTS. No aircraft anomalies can be discerned and the problem is thought to be related to the very strong gusting winds; a third attempt was made during without difficulty.
Narrative: Aircraft disengaged flight director modes and disengaged autothrottles on takeoff roll around 40 KTS; got master caution message. We aborted takeoff. Ran checklists and everything was compliant for a second takeoff. [We] got clearance for takeoff from Tower. Again on the takeoff roll around 40 KTS; the aircraft disengaged the flight director modes; disengaged the autothrottles; and got a master caution message. We aborted takeoff. Ran checklists. At the time; outside temperature was -3 with snow; blowing snow; winds at 140 [degree] 35 gusting to 45. When we stopped with the parking brake on to run checklists; we noticed that the airspeed indicator was indicating 10 to as high at 60 KTS due to the strong wind gusts. We felt the wind gusts were giving the airplane unstable indications; and waited for a calm spot between gusts to try one last takeoff. [We] were able to take off on the third try without any abnormalities.
Data retrieved from NASA's ASRS site as of July 2013 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.