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| Title: | Uncommanded yaw on rollout, Incident, Fokker F-27, D-AELF, Billund Airport |
| Micro summary: | This airplane experienced an uncommanded yaw to the left on landing. |
| Event Time: | 2000-11-27 at 0322 UTC |
| File Name: | 2000-11-27-DK.pdf |
| Publishing Agency: | Accident Investigation Board (AIB) |
| Publishing Country: | Denmark |
| Report number: | HCL 72/00 |
| Pages: | 1 |
| Site of event: | Landing, Billund Airport |
| Departure: | Unknown |
| Destination: | Billund Airport, Billund, Denmark |
| Airplane Type(s): | Fokker F-27 |
| Flight Phase: | Landing |
| Registration(s): | D-AELF |
| Operator(s): | WDL Aviation |
| Type of flight: | Revenue |
| Occupants: | 2 |
| Fatalities: | 0 |
| Serious Injuries: | 0 |
| Minor/Non-Injured: | 2 |
| Other Injuries: | 0 |
| Executive Summary: | The incident took place during the landing roll on runway 27. Having locked the gust locks the flight crew experienced that the aircraft started to turn to the left. It was not possible for the flight crew to stop the left turn either by using the nose wheel steering or using differential braking. The aircraft ran off the side of the runway between taxiway Charlie and taxiway Bravo with an indicated airspeed of approximately 30 knots. There was no damage to the aircraft and the aircraft was able to taxi back to the runway by its own power and subsequently to the parking area. Readout of the Flight Data Recorder (FDR) was done by the Bundesstelle für Flugunfalluntersuchung/BFU. The FDR itself was in a poor condition and the data quality was rather poor. The FDR was declared unserviceable and sent back to the operator. A technical investigation of the aircraft led to the following findings: The no. 4 brake system was found unserviceable and the follow up control valve for the nose wheel steering did not work properly. The incident took place at dark night and under visual meteorological conditions (VMC). |
| Learning Keywords: | Operations - Braking Issues (General) |
| Operations - Runway Excursion | |
| Operations - Upset - Uncommanded or excessive Yaw |
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