AD 2007-15-02 Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

This AD applies to all Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category.

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 of the Maintenance Requirements Manual (MRM) (f) Within 60 days after the effective date of this AD, revise the Canadair Regional Jet MRM CSP A-053 by doing the actions specified in paragraphs (f)(1) and (f)(2) of this AD. When the tasks specified in Canadair Regional Jet Temporary Revisions 2A-20, dated March 13, 2006; and 1-2-33, dated October 27, 2005; are included in the general revisions of the MRM, the general revisions may be inserted in the MRM, and these temporary revisions may be removed. (1) Revise the Certification Maintenance Requirements section of the Canadair Regional Jet MRM to include Tasks C27-10-105-06 and C27-10-105-05, as specified in Canadair Regional Jet Temporary Revision 2A-20, dated March 13, 2006, to Part 2, Appendix A—Certification Maintenance Requirements, of the Canadair Regional Jet MRM CSP A-053. (2) Revise the Maintenance Review Board Report for Section 2—Systems and Powerplant Program, of Part 1 of the Canadair Regional Jet MRM CSP A-053, to include the task interval for Task 27-11-00-09, as specified in Canadair Regional Jet Temporary Revision 1-2-33, dated October 27, 2005. Incorporating Revision 10, dated May 27, 2005, of the Canadair Regional Jet Maintenance Review Board Report for Section 2—Systems and Powerplant Program of the Canadair Regional Jet MRM CSP A-053 is one approved method for including the task interval specified in Canadair Regional Jet Temporary Revision 1-2-33. After the task interval has been incorporated into the MRM, no alternative aileron backlash check interval in excess of 2,000 flight hours may be approved, except as specified in paragraphs (g) and (h) of this AD. Phase-In Schedule for Initial Inspection Specified in MRM Revisions (g) For airplanes with more than 1,000 flight hours but less than 3,000 flight hours since the last aileron backlash check specified in Task 27-11-00-09 was accomplished, as of the effective date of this AD: Within 1,000 flight hours after the effective date of this AD, do the next aileron backlash check in accordance with Task 27-11-00-09, as specified in Canadair Regional Jet Temporary Revision 1-2-33, dated October 27, 2005. (h) For airplanes with 3,000 flight hours or more since the last aileron backlash check specified in Task 27-11-00-09 was accomplished, as of the effective date of this AD: Within 4,000 flight hours after the last aileron backlash check, do the next aileron backlash check in accordance with Task 27-11-00-09, as specified in Canadair Regional Jet Temporary Revision 1-2-33, dated October 27, 2005. One Approved Method for Task C27-10-105-06 (i) For airplanes without access to ground support equipment necessary to do the PCU internal leakage functional check, as specified in Task C27-10-105-06 specified in paragraph (f)(1) of this AD: Doing the aileron PCU internal leakage check in accordance with Task 27-11-00-220-803 of Chapter 27-11-00 of the Canadair Regional Jet Aircraft Maintenance Manual at intervals not to exceed 4,000 flight hours is one approved method for accomplishing Task C27-10-105-06, and is acceptable for up to 12 months after the effective date of this AD. Thereafter, the check must be done in accordance with Task C27-10-105-06 as specified in paragraph (f)(1) of this AD at a repetitive interval not to exceed that specified in the task. Alternative Methods of Compliance (AMOCs) (j)(1) 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. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. Related Information (k) Canadian airworthiness directive CF-2006-04, dated March 22, 2006, also addresses the subject of this AD. Material Incorporated by Reference (l) You must use Canadair Regional Jet Temporary Revision 1-2-33, dated October 27, 2005, to the Canadair Regional Jet Maintenance Review Manual CSP A-053; and Canadair Regional Jet Temporary Revision 2A-20, dated March 13, 2006, to the Canadair Regional Jet Maintenance Review Manual CSP A-053; 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 these documents 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 FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html . Issued in Renton, Washington, on July 11, 2007. Stephen P. Boyd, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-13983 Filed 7-23-07; 8:45 am] BILLING CODE 4910-13-P

This AD results from a report that data collected from in-service airplanes show that approximately 19 percent of aileron backlash checks conducted at 4,000-flight-hour intervals reveal that aileron backlash wear limits are being exceeded. We are issuing this AD to prevent exceeded backlashes in both aileron power control units (PCUs), which, if accompanied by the failure of the flutter damper, could result in aileron vibration/flutter and reduced controllability of the airplane.