North Flying SW4 at Oslo on Mar 2nd 2011, runway excursion on landing

Last Update: June 28, 2012 / 20:49:42 GMT/Zulu time

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Incident Facts

Date of incident
Mar 2, 2011

Classification
Accident

ICAO Type Designator
SW4

The Norwegian Statens Havarikomisjon for Transport (AIBN) released their final report in Norwegian concluding:

The AIBN believes directional control was lost as result of a temporary glitch in the nose wheel steering system. Despite extensive studies it was not possible to determine which component malfunctioned or where in the system the error occurred.

The aircraft was approaching Oslo's runway 19R properly configured with brakes set to medium in calm winds, temperature -7 degrees C and reduced visibility in freezing fog, the runway was "black" with no contamination like snow or ice, its braking efficiency was reported as medium. The first officer (47, CPL, 5,187 hours total, 2,537 hours on type) was pilot flying, the captain (33, ATPL, 2,398 hours total, 1,278 hours on type) pilot monitoring.

The approach was uneventful and fully stabilized, the aircraft crossed the runway threshold at 107 KIAS (Vapp, Vref+10) and touched down within the landing zone. The first stages of the roll out were normal, when the aircraft slowed through 60 knots the captain assumed control of the aircraft in line with company procedures. He pulled the power levers to ground idle and ordered the speed levers to be pulled to "LOW" according to company procedures which would activate the nose wheel steering system with the right speed lever in position low. As soon as the first officer had pulled the right speed lever to low, the aircraft began to turn right, the captain fully deflected the pedals (controlling the nose wheel steering) to the left without any corrective effect. The aircraft struck a snow bank past the edge of the runway at an estimated speed of about 30-40 knots and quickly stopped. The crew shut the engines down, turned the main power switch off and initiated an evacuation. Tower control could not see the aircraft and noticed the aircraft at the right hand edge of the runway on his ground radar and queried the crew. Upon learning they had veered off the runway and were firmly stuck in a snow bank the tower controller pressed the crash button to alert emergency services.

No injuries occurred, the aircraft received substantial damage.

The AIBN reported that the same fault had occurred 6 days earlier as well, during that encounter the captain managed to disconnect nose wheel steering quickly enough to regain control. Maintenance could not replace the fault and the aircraft was returned to service.
Incident Facts

Date of incident
Mar 2, 2011

Classification
Accident

ICAO Type Designator
SW4

This article is published under license from Avherald.com. © of text by Avherald.com.
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