Company maintenance personnel’s failure to comply with the airplane manufacturer’s service instructions by not removing the cracked drag brace from service nor inspecting the repaired drag brace at the appropriate interval, which resulted in the failure of the nose landing gear drag brace due to fatigue cracking and collapse of the nose landing gear during the landing roll. Contributing to the failure of the nose landing gear drag brace was the failure of the repair station to detect a remaining portion of a crack following repair.

Installation of an improper bearing in the landing gear actuator.