AD 2006-11-09 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, serial numbers 7003 and subsequent, certificated in any category; on which Bombardier Modsum TC601R16421 or TC601R16422 has not been accomplished.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. 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 the procedures specified in paragraph (g) 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. Maintenance Requirements Manual Revision (f) Within 30 days after the effective date of this AD, revise the Airworthiness Limitations (AWL) section (Appendix B) of the Instructions for Continuing Airworthiness of the Canadair Regional Jet Maintenance Requirements Manual (MRM), to include the information specified in AWL Task 53-61-141 in Canadair Regional Jet Temporary Revision (TR) 2B-2109, dated October 13, 2005. Thereafter, except as provided by paragraph (g) of this AD, no alternative structural inspection intervals may be approved for the cargo door skin cut-out. Note 2: The actions required by paragraph (f) of this AD may be done by inserting a copy of TR 2B-2109 into the AWL section of the Canadair Regional Jet MRM. When the contents of TR have been included in general revisions of the MRM, the general revisions may be inserted in the MRM, provided the relevant information in the general revision is identical to that in TR 2B-2109. Alternative Methods of Compliance (AMOCs) (g)(1) The Manager, New York Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19. (2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Related Information (h) Canadian airworthiness directive CF-2005-05, dated February 18, 2005, also addresses the subject of this AD. Material Incorporated by Reference (i) You must use Canadair Regional Jet Temporary Revision 2B-2109, dated October 13, 2005, Part 2, Appendix B of the Canadair Regional Jet Maintenance Requirements Manual to perform the actions that are required by this AD, unless the AD specifies otherwise. The Director of the Federal Register approved the incorporation by reference of this document in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station Centre-ville, Montreal, Quebec H3C 3G9, Canada, for a copy of this service information. You may review copies at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., Room PL-401, Nassif Building, Washington, DC; on the Internet at http://dms.dot.gov; or at 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 16, 2006. Kevin M. Mullin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 06-4847 Filed 5-25-06; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report that a crack was discovered at the lower forward corner of a cargo door skin cut-out during fatigue testing. We are issuing this AD to detect and correct cracking in the lower forward corner of the cargo door skin cut-out, which could result in reduced structural integrity of the airplane