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 issuance of revised certification maintenance requirements (CMR) for the horizontal stabilizer trim actuator (HSTA). This proposed AD would require revising the maintenance or inspection program. We are proposing this AD to detect and correct premature wear and cracking of the HSTAs, which could result in reduced structural integrity and reduced control of the airplane due to the failure of system components.