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Uncommanded deviations in the yaw axis during late stages of the takeoff roll resulted in a rejected takeoff performed by the flight crew of an unidentified air carrier aircraft.
| Attributes | |
| ACN | 1036473 |
| Time | |
| Date | 201209 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 7200 Flight Crew Type 594 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 6500 Flight Crew Type 1500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
We were cleared for takeoff and the captain set the power and accelerated normally. I made the 100 KT call and then the aircraft yawed to the left and then snapped back towards the centerline. It then did this once more and the captain initiated an abort. I made the call to tower that we were aborting. We slowed the aircraft and then taxied off the runway.I made the 'remain seated' call to the passengers and tower asked if we could turn onto the delta taxiway. We did; but we did not set the parking brake. I requested crash fire rescue equipment be sent to check for any indication of a fire and then ran the QRH with the captain during which we noted the brakes were in the cooling zone of the brake cooling chart. I spoke with the flight attendants and the captain made an announcement to the passengers. Once we determined there was no fire and that we could return safely to the gate; I called maintenance; operations; and the ramp while the captain talked to ground and taxied to the gate. Before coming to a stop; we made sure the ground crew knew not to chalk the mains; only the nose wheel. Once at a stop; we shut down the engines. Emergency services came up and said that the brakes reached 650 degrees. We spoke to the flight attendants on the ground who said they felt the yaw and that the rear flight attendants were thrown side to side in their jump seats. There were no injuries reported.
Original NASA ASRS Text
Title: Uncommanded deviations in the yaw axis during late stages of the takeoff roll resulted in a rejected takeoff performed by the flight crew of an unidentified air carrier aircraft.
Narrative: We were cleared for takeoff and the Captain set the power and accelerated normally. I made the 100 KT call and then the aircraft yawed to the left and then snapped back towards the centerline. It then did this once more and the Captain initiated an abort. I made the call to Tower that we were aborting. We slowed the aircraft and then taxied off the runway.I made the 'Remain Seated' call to the passengers and Tower asked if we could turn onto the Delta Taxiway. We did; but we did not set the parking brake. I requested CFR be sent to check for any indication of a fire and then ran the QRH with the Captain during which we noted the brakes were in the Cooling Zone of the brake cooling chart. I spoke with the Flight Attendants and the Captain made an announcement to the passengers. Once we determined there was no fire and that we could return safely to the gate; I called Maintenance; Operations; and the ramp while the Captain talked to Ground and taxied to the gate. Before coming to a stop; we made sure the ground crew knew not to chalk the mains; only the nose wheel. Once at a stop; we shut down the engines. Emergency Services came up and said that the brakes reached 650 degrees. We spoke to the flight attendants on the ground who said they felt the yaw and that the rear flight attendants were thrown side to side in their jump seats. There were no injuries reported.
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.