Airworthiness Directives; Bombardier, Inc., Airplanes

We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model DHC-8-400 series airplanes. This proposed AD was prompted by reports of the nose landing gear (NLG) locking in a partially extended position due to loose bushings on the lock link of the NLG locking mechanism. This proposed AD would require inspecting the bushings and the lower lock link of the NLG for discrepancies, and corrective actions if necessary. We are proposing this AD to address the unsafe condition on these products.