AD 2004-22-08 Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes

All Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes, certificated in any category.

Required as indicated, unless accomplished previously. To prevent disconnection of an air supply duct, which, if combined with failure of a bulkhead check valve, could result in rapid depressurization of the airplane, accomplish the following: Service Information References (a) Paragraphs (a)(1), (a)(2), (a)(3), and (a)(4) of this AD pertain to the service information referenced in this AD. (1) The term service bulletin, as used in this AD, means the Accomplishment Instructions of Bombardier Alert Service Bulletin A601R-21-053, Revision ‘A,’ dated January 28, 2003; and Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001; as applicable. (2) Although the service bulletins referenced in this AD specify to submit certain information to the manufacturer, this AD does not include such a requirement. (3) Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001, recommends sending all damaged check valves to the manufacturer for analysis; however, this AD does not include that requirement. (4) Accomplishment of the actions specified in Bombardier Alert Service Bulletin A601R-21-053, dated November 8, 2001, before the effective date of this AD is considered acceptable for compliance with the applicable actions specified in this AD. Repetitive Inspections/Related Corrective Actions (b) Within 500 flight hours after the effective date of this AD: Do the detailed inspections and related corrective actions required by paragraphs (b)(1) and (b)(2) of this AD, per the applicable service bulletin. (1) For airplanes having bulkhead check valves with part number (P/N) 92E20-3/-4, as identified in Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001: Inspect the left- and right-hand bulkhead check valves for damage (cracking, breakage). If any damage is found, before further flight, replace the damaged valve. Repeat the inspection at intervals not to exceed 4,000 flight hours. (2) For airplanes having serial numbers 7003 through 7067 inclusive, and 7069 through 7477 inclusive: Inspect the left- and right-hand air supply ducts of the rear bulkhead for damage (tearing, delamination, or cracking). If any damage is found, before further flight, either rework or replace the damaged air supply duct, which ends the inspections for that air supply duct only. If no damage is found, repeat the inspection thereafter at intervals not to exceed 500 flight hours until accomplishment of paragraph (c) of this AD. Note 1: For the purposes of this AD, a detailed inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required. Terminating Action for Repetitive Inspections of Air Supply Ducts (c) Except as required by paragraph (b)(2) of this AD, for airplanes having serial numbers 7003 through 7067 inclusive, and 7069 through 7477 inclusive: Within 5,000 flight hours after the effective date of this AD, either rework or replace the left- and right-hand air ducts, as applicable, per the applicable service bulletin. Accomplishment of this paragraph ends the repetitive inspections required by paragraph (b)(2) of this AD. Alternative Methods of Compliance (d) In accordance with 14 CFR 39.19, the Manager, New York Aircraft Certification Office, FAA, is authorized to approve alternative methods of compliance for this AD. Incorporation by Reference (e) Unless otherwise specified in this AD, the actions shall be done in accordance with Bombardier Alert Service Bulletin A601R-21-053, Revision ‘A,’ dated January 28, 2003; and Bombardier Alert Service Bulletin A601R-21-054, dated November 8, 2001; as applicable. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station Centre-ville, Montreal, Quebec H3C 3G9, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, suite 410, Westbury, New York; 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/code_of_federal_regulations/ibr_locations.html. Note 2: The subject of this AD is addressed in Canadian airworthiness directive CF-2003-05, dated February 4, 2003. Effective Date (f) This amendment becomes effective on December 2, 2004. Issued in Renton, Washington, on October 18, 2004. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 04-24028 Filed 10-27-04; 8:45 am] BILLING CODE 4910-13-P