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

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The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all Bombardier Model CL-600-2B19 series airplanes. The existing AD currently requires revising the Airplane Flight Manual (AFM) to provide the flightcrew with operating limitations and procedures to enable them to maintain controllability of the airplane in the event that aileron control stiffness is encountered during flight. This proposed AD would revise the Airworthiness Limitations section of the Instructions of Continued Airworthiness to incorporate certain repetitive tasks for the aileron control system and would require a briefing to advise flight crews that certain aileron control checks are no longer required. After accomplishing the applicable initial tasks, the existing AFM revisions for the aileron control check may be removed from the AFM. This proposed AD is prompted by the development of terminating actions for the AFM revisions. We are proposing this AD to prevent aileron control stiffness during flight, which could result in reduced or possible loss of controllability of the airplane.