Airworthiness Directive · Amendment 39-18361 · Flight controls
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, serial numbers 7003 and subsequent, equipped with horizontal stabilizer trim actuator (HSTA) part numbers (P/N) 601R92305-1 (vendor P/N 8396-2), 601R92305-3 (vendor P/N 8396-3), or 601R92305-5 (vendor P/N 8396-4).
We are 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 reports that the horizontal stabilizer trim actuator (HSTA) spur gear bolts inside the gearbox were found loose, broken, or backed out due to incorrect bending of the anti-rotation tab washer and the improper application of Loctite glue during installation. This AD requires replacing certain HSTAs with a new HSTA. This AD also requires revising the airplane flight manual (AFM) and the maintenance or inspection program, as applicable. We are issuing this AD to prevent failure of the HSTA and subsequent loss of control of the airplane.
Within 30 days after the effective date of this AD, revise the Limitations section and Normal Procedures section of the AFM to include the information in Supplement 23, “Horizontal Stabilizer Trim Check,” of Chapter 7 “Supplements,” of Bombardier CL-600-2B19 Airplane Flight Manual CSP A-012, Volume 3, Revision 61, dated April 2, 2013.
Within 30 days after the effective date of this AD, revise the maintenance or inspection program, as applicable, to incorporate Task C27-40-103-04, “Operational Check (ground maintenance test) of the horizontal stabilizer trim control unit,” specified in Bombardier CL-600-2B19 Temporary Revision 2A-56, dated June 4, 2012, to Appendix A, Certification Maintenance Requirements, of Part 2, Airworthiness Requirements, of the Bombardier CL-600-2B19 Maintenance Requirements Manual (MRM). The compliance time for the initial operational check is within 500 flight hours after the effective date of this AD.
After accomplishing the revision required by paragraph (h) of this AD, no alternative actions (e.g., inspections) and/or intervals may be used unless the actions and/or intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (m)(1) of this AD.
(1) For airplanes equipped with an HSTA having P/N 601R92305-1 (vendor P/N 8396-2) or P/N 601R92305-3 (vendor P/N 8396-3): At the earlier of the times specified in paragraphs (j)(1)(i) and (j)(1)(ii) of this AD, replace the HSTA with a new HSTA having P/N 601R92305-7 (vendor P/N 8396-5), in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601R-27-161, Revision A, dated January 30, 2014. The compliance times specified in paragraphs (j)(1)(i) and (j)(1)(ii) of this AD do not alleviate any existing life limit requirements.
(i) Within 3,700 flight hours after the effective date of this AD.
(ii) Within 27 months after the effective date of this AD.
(2) For airplanes equipped with an HSTA having P/N 601R92305-5 (vendor P/N 8396-4): At the earlier of the times specified in paragraphs (j)(2)(i), (j)(2)(ii), and (j)(2)(iii) of this AD, replace the HSTA with a new HSTA having P/N 601R92305-7 (vendor P/N 8396-5), in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 601R-27-161, Revision A, dated January 30, 2014. The compliance times specified in paragraphs (j)(2)(i), (j)(2)(ii), and (j)(2)(iii) of this AD do not alleviate any existing life limit requirements.
(i) Within 4,400 flight hours after the effective date of this AD.
(ii) Within 32 months after the effective date of this AD.
(iii) Before the accumulation of 10,000 total flight hours on HSTA P/N 60192305-5 (vendor P/N 8396-4).
