AD 2005-10-10 Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

This AD applies to Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category, having serial numbers 7003 and subsequent. Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (j) of this AD. The request should include a description of changes to the required inspections that will ensure the continued damage tolerance of the affected structure. The FAA has provided guidance for this determination in Advisory Circular (AC) 25-1529.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Revision to the Airworthiness Limitations (AWL) Section (f) Within 30 days after the effective date of this AD: Revise the AWL section of the Instructions for Continued Airworthiness of the Canadair Regional Jet Maintenance Requirements Manual (MRM), CSP A-053, Appendix A, “Certification Maintenance Requirements,” by incorporating Task C27-42-103-01, “Detailed Inspection of the HSTA Secondary Load Path Indicator” of Canadair Regional Jet Temporary Revision 2A-8, dated December 10, 2003, into the AWL section. Thereafter, except as provided by paragraph (j) of this AD, no alternative structural inspection intervals may be approved for this HSTA secondary load path indicator. (g) When the information in Canadair Regional Jet Temporary Revision 2A-8, dated December 10, 2003, is included in the general revisions of the MRM, the general revisions may be inserted into the AWL section of the Instructions for Continued Airworthiness and this temporary revision may be removed from the MRM. Initial Inspection Phase-In Schedule (h) Prior to accumulating 5,000 total flight hours on the HSTA or within 500 flight hours after the effective date of this AD, whichever occurs later: Do the initial inspection of the HSTA secondary load path indicator according to the task specified in paragraph (f) of this AD. Initial Inspections According to Bombardier Service Bulletin A601R-27-128 (i) Inspections of the HSTA secondary load path indicator accomplished before the effective date of this AD in accordance with Bombardier Alert Service Bulletin A601R-27-128, dated February 17, 2003; Revision A, dated April 17, 2003; or Revision B, dated March 2, 2005; are acceptable for compliance with the initial inspection requirement of paragraph (h) of this AD. Alternative Methods of Compliance (AMOCs) (j) The Manager, New York Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. Related Information (k) Canadian airworthiness directive CF-2005-04, dated February 14, 2005, also addresses the subject of this AD. Material Incorporated by Reference (l) You must use Canadair Regional Jet Temporary Revision 2A-8, dated December 10, 2003, to the Canadair Regional Jet Maintenance Requirements Manual, CSP A-053, Appendix A, “Certification Maintenance Requirements,” to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approves the incorporation by reference of this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. To get copies of the service information, contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station Centreville, Montreal, Quebec H3C 3G9, Canada. To view the AD docket, go to the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Nassif Building, Washington, DC. To review copies of the service information, go to the National Archives and Records Administration (NARA). For information on the availability of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html . Issued in Renton, Washington, on May 5, 2005. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 05-9553 Filed 5-16-05; 8:45 am] BILLING CODE 4910-13-P067

This AD is prompted by a report of a potential failure of the horizontal stabilizer trim actuator (HSTA) secondary nut in conjunction with a latent failure of the HSTA primary load path discovered during sampling program activities. We are issuing this AD to detect and correct latent failure of the primary load path of the HSTA, which, in conjunction with a failure of the HSTA secondary nut, could result in loss of horizontal trim control and consequent reduced controllability of the airplane.