We are [FAA] adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes.
This AD was prompted by a determination that certain flap actuators require restoration by installing a redesigned flap actuator inboard pinion seal.
This AD requires revising the maintenance program by incorporating new airworthiness limitation tasks. We are issuing this AD to prevent flap system failure, and consequent reduced control of the airplane.
This AD becomes effective September 10, 2013.