Summary
We propose to supersede an existing airworthiness directive (AD) that applies to certain Bombardier, Inc. Model CL-600-1A11 (CL- 600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. The existing AD currently requires operators to assign serial numbers or part numbers to certain landing gear parts; and to establish the number of landings on the parts, if necessary. The existing AD also requires operators to revise the Airworthiness Limitations Section (ALS) of the Instructions for Continued Airworthiness (ICA) to reflect the new life limits of the landing gear parts. Since we issued that AD, additional landing gear parts have been identified that need serialization. This proposed AD would add airplanes to the applicability; require operators to assign serial numbers or part numbers to certain additional landing gear parts, to establish the number of landings on the parts, if necessary; and record in all required airplane technical records and manuals the new part numbers, serial numbers, and landings assigned to these parts. We are proposing this AD to prevent life-limited landing gear parts from being used beyond their safe-life limits, which could lead to collapse of the landing gear.