The nose landing gear of the Airbus A320-200 was jammed, but the tires were perpendicular to the fuselage. How did that happen?
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During flight, Brake Steering Control Unit (BSCU) performs1 cyclic tests which slightly rotates NLG from the 0° position. Due to this fatigue, two of the four anti-rotation lugs on the NLG upper support assembly fractured and separated. This allowed NLG to deviate from the 0° position. Another contributing factor was BSCU system logic, which prevented NLG from centering. Also contributing was the lack of a procedure to attempt to reset the BSCU system under these conditions.
This website has some nice pictures of nose landing gear before and after the landing.
A summary of the investigation can be found here.
1: BSCU has other functions too.