 The Lear 45 was certified under FAR Part 25 (transport category rules), rather than FAR Part 23 (often used in earlier business jets).The stricter Part 25 certification requires greater system redundancy, and requires that the airplane reliably meets the performance numbers published in the aircraft's FAA-approved Pilot's Operating Handbook (POH).Dual-wheel, trailing link, main landing gear is provided, with digital nosewheel steering facilitating tight turns.