Airworthiness Directives; Bombardier Model CL-600-2B16 (CL-601-3A and -3R) and CL-600-2B19 (Regional Jet Series 100) Series Airplanes

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Bombardier Model CL-600- 2B16 and CL-600-2B19 series airplanes. This proposal would require a one-time inspection of the spring bungee assembly of the nose landing gear (NLG) to ensure proper torque of the collar and correct clearance between the collar and the body of the bungee, and replacement of the spring bungee assembly with a serviceable unit, if necessary. This proposal is prompted by reports of failure of the NLG to extend when the landing gear selector was placed in the ``DOWN'' position, and failure of the NLG doors to open when the NLG door switch was set in the ``SAFETY/DOOR OPEN'' position; these conditions may have been caused by a reduced stroke of the spring bungee. The actions specified by the proposed AD are intended to prevent improper operation of the NLG door and consequent inability to extend the NLG due to a reduced stroke of the spring bungee.