Summary
We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This proposed AD was prompted by a determination that certain flap actuators require restoration by installing a redesigned flap actuator inboard pinion seal. This proposed AD would require revising the maintenance program by incorporating new airworthiness limitation tasks. We are proposing this AD to prevent flap system failure, and consequent reduced landing performance of the airplane.