Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD requires inspecting to identify the wing anti-ice ducts (piccolo tubes) in the wing leading edge. For airplanes with affected piccolo tubes, this AD requires revising the airplane flight manual (AFM) to introduce new procedures for operation in icing conditions. The optional implementation of repetitive inspections for cracks of affected piccolo tubes, and corrective actions if necessary, terminates the operational limitations. The optional installation of certain new piccolo tubes terminates both the AFM revision and the inspections. This AD was prompted by reports of failed piccolo tubes. We are issuing this AD to prevent cracked piccolo tubes, which could result in air leakage, a possible adverse effect on the anti-ice air distribution pattern and anti-ice capability without annunciation to the flight crew, and consequent reduced controllability of the airplane.