AD 97-14-11 Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 and 200) Series Airplanes

Model CL-600-2B19 (Regional Jet Series 100 and 200) series airplanes, serial numbers 7003 and subsequent; certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To detect and correct fatigue cracking in the underfloor pressure bulkhead of the fuselage, which could result in uncontrolled depressurization of the airplane and/or reduced structural integrity of the fuselage, accomplish the following: (a) Within 20 flight hours after the effective date of this AD, perform a detailed visual inspection to detect cracks at frame station (FS) 409+128 of the bulkhead web [part number (P/N) 601R32208-123] of the fuselage, in accordance with Canadair Regional Jet Alert Service Bulletin A601R-53-045, dated June 25, 1997. (1) If no crack is detected or if all three of the conditions specified in paragraphs (a)(1)(i), (a)(1)(ii), and (a)(1)(iii) of this AD are met, continued flight is allowed. Repeat the detailed visual inspection thereafter at intervals not to exceed 100 flight hours. (i) No more than one crack exists at each corner; and [[Page 38208]] (ii) No crack extends under the angles having P/N 601R32208-79 and P/N 601R32208-81 on the aft side of the bulkhead web; and (iii) No crack exists in angles having P/N 601R32208-79 and P/N 601R32208-81 on the aft side of the bulkhead web. (2) If any cracking other than that identified in paragraphs (a)(1)(i), (a)(1)(ii), and (a)(1)(iii) of this AD is detected, prior to further flight, repair it in accordance with the method approved by the Manager, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. (b) Within 10 days after accomplishing the initial and repetitive detailed visual inspections required by paragraph (a) of this AD, submit a report of any finding(s) of cracking to the Manager, New York ACO, telephone (516) 256-7525; fax (516) 568-2716. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120- 0056. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York ACO. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. (d) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (e) The inspections shall be done in accordance with Canadair Regional Jet Alert Service Bulletin A601R-53-045, dated June 25, 1997. 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 Transport Canada Aviation. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on July 22, 1997. All persons except those persons to whom it was made immediately effective by emergency AD 97-14-11, issued on June 27, 1997, which contained the requirements of this amendment. Issued in Renton, Washington, on July 11, 1997. James V. Devany, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 97-18934 Filed 7-16-97; 8:45 am] BILLING CODE 4910-13-P-M