(Adds no immediate comments from FAA, Bombardier; details, paragraphs 3-7) By David Shepardson Oct 29 (Reuters) – The National Transportation Safety Board on Wednesday issued an urgent recommendation to operators of 10 Bombardier Learjet airplane models to ensure main landing gear is attached correctly. The recommendation to the Federal Aviation Administration to mandate compliance with manufacturer service bulletins on landing gear would cover 1,883 airplanes currently in service. The recommendation stems from the investigation of a fatal February 10 runway incident in Scottsdale, Arizona, involving a Learjet 35A, and three prior events in which Learjet landing gear disconnected from the airframe because a retaining bolt was not engaged through an aft pin. In the February incident, the Le

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