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In flight, the nose gear is electronically centered by the steering control unit (SCU), and mechanically centered by centering cams as the oleo extends with the assistance of the nitrogen filled strut and under the weight of the springs and wheel as-semblies. A spring-operated external lock mechanism on the drag brace mechanically locks the nose gear in the extended position. A NLG ground locking pin can be inserted into the upper drag brace sub-assembly to prevent inadvertent unlocking while the aircraft is on the ground. The NLG also contains the steering manifold assembly and steering actuator which provides steering and castering func-tions for the NLG during ground maneuvers. With the torque link attached, the gear can only be rotated 120° in either direction. Attempting to rotate beyond this causes a switch to trip, resulting in a NWS LIMIT EXCEEDED (C) CAS message and potential structural damage. In addition to the cockpit indication, the feedback mechanism also incorporates indicator pins at approximately ±123° of steering angle. If the steering angle exceeds this value during towing while the torque links are connected, these pins are designed to yield to indicate the need to inspect the feedback links and surrounding area as detailed in the AMM for possible damage. For special hangar operations, the torque links may be disconnected to allow towing at any angle provided the NLG shock strut extension exceeds 3.50 inches of chrome showing. NOSE DOORS DOOR RETRACTION ACTUATOR A downlock safety pin, within the drag brace assembly, secures the nose landing gear in position while on ground. 中国公务机网 www.gongwuji.com 公务机翻译 www.aviation.cn 本文链接地址：庞巴迪挑战者300公务机机组操作手册 Bombardier Challenger-起落架(6) |
