Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This proposed AD would require doing repetitive inspections for fractures and cracks of the links of the aileron power control unit (PCU); replacing any fractured/cracked link; and doing applicable related investigative and corrective actions, if necessary. This proposed AD is prompted by reports indicating that the links of the aileron PCU have failed. We are proposing this AD to prevent failure of both links of the aileron PCU, which could result in reduced lateral control of the airplane.