The flight crew reported that the flight was uneventful until the nosewheel touched down, at which time, the airplane made an uncommanded left turn and then veered off the runway. Examination of the runway revealed a witness mark from the right nosewheel tire chine consistent with a left deflection of the nosewheel steering. Testing of the nosewheel steering system and its components did not reveal any anomalies that would have precluded normal operation. The pilot reported that he used a bracket to support his approach plate book and that, during the event, the book slid off of the bracket and onto his lap. He then tossed the book out of the way. He stated that, at some point, the book may have been in the area of the nosewheel tiller but that it was not on the tiller and that it was clear of the tiller before the airplane exited the runway. Although it is possible that the weight of a book engaged the tiller, it could not be determined if the tiller was engaged during the event.
The uncommanded left deflection of the airplane's nosewheel for reasons that could not be determined because postincident examination of the nosewheel steering system did not reveal any anomalies that would have precluded normal operation.
— 6,779 samples, 58 parameters, 25:04:25.0 to 25:05:49.9.
| Parameter | Max | at | Min | at | Final | at |
|---|---|---|---|---|---|---|
| Pressure altitude ft | 1,122.5 | 25:04:25.9 | 773.5 | 25:05:47.9 | 774.0 | 25:05:49.9 |
| Pitch attitude deg | 5.4 | 25:04:54.2 | -1.4 | 25:05:13.4 | -1.3 | 25:05:49.9 |
| Roll attitude deg | 3.7 | 25:04:54.2 | -3.7 | 25:04:33.7 | -0.5 | 25:05:49.7 |
| Vertical acceleration g | 1.3 | 25:04:57.2 | 0.7 | 25:04:57.8 | 1.0 | 25:05:49.9 |
| Engine 1 N1 %RPM | 62.8 | 25:05:07.1 | 24.3 | 25:05:13.1 | 24.5 | 25:05:49.1 |
| Engine 2 N1 %RPM | 61.5 | 25:05:07.6 | 24.5 | 25:05:13.6 | 24.6 | 25:05:49.6 |
| Time | Event | Page |
|---|---|---|
| 00:08 EDT | Descending through 1,700 ft pressure altitude on a magnetic heading of about 233 deg (runway 23) | 2 |
| 00:08:45 EDT | Air/ground switch to ground (touchdown), followed by symmetric spoiler and thrust reverser deployment; pilot brake pedal activity began | 2 |
| 00:08:49 EDT | Copilot's right brake pedal began to show activity | 3 |
| 00:08:52 EDT | Magnetic heading began to swing left as indicated airspeed fell below 100 kts | 3 |
| 00:08:53 EDT | Rudder reached its maximum deflection of 12.7 deg right (correcting the left swing) | 3 |
| 00:08:55 EDT | Left and right ailerons at maximum deflection, 16.5 deg TED and 24.4 deg TEU (full right wheel) | 3 |
| about 00:09:04 EDT | Aircraft came to rest on a magnetic heading of 199 deg (34 deg left of runway heading) | 3 |
163 transcribed utterances from 00:07:39.7 to 00:14:50.0, 15 sources. Final entries:
| 00:14:21.8 | HOT | [sound of single chime, similar to master caution] |
| 00:14:21.9 | HOT-2 | I got the gust lock set. |
| 00:14:23.9 | TWR | Rescue eleven tower. |
| 00:14:35.3 | HOT-2 | ah gust lock. the flaps I'm gonna leave there. |
| 00:14:50.0 | HOT-2 | parking brake. |
Docket: data.ntsb.gov/Docket/?NTSBNumber=CEN11IA234. This brief is an analytical aid assembled from public records; it is not an investigative finding.