AD FAA-2012-0639

We are adopting a new airworthiness directive (AD) for all Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. This AD was prompted by a report that the safe life limit and inspection requirements for the horizontal stabilizer trim actuator (HSTA) attachment pins and trunnions were not listed in the Airworthiness Limitations Section of the maintenance program. This AD requires inspecting the trunnions and upper and lower pins for gouges, scratches, and corrosion, and replacing the trunnions if necessary; and adding serial numbers and new part numbers to certain trunnions, and upper and lower pins. This AD also requires revising the maintenance program to incorporate the information specified in certain temporary revisions of the limitations section. We are issuing this AD to detect and correct cracking, gouges, scratches, and corrosion of the HSTA attachment pins and trunnions, which could result in failure of these pins and trunnions and consequent disconnection of the horizontal stabilizer and subsequent loss of controllability of the airplane.