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95-08-15
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CCOC Rupture Category
- Engine Applicability: Pratt & Whitney (PW) Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines, with combustion chamber outer cases (CCOC) Part Numbers (P/N) 490547, 542155, 616315, 728829, 728829-001, 730413, 730413-001, 730414, 730414-001, 767197, 767279, and 767279-001. These engines are installed on but not limited to Boeing 737 series and 727 series, and McDonnell Douglas DC-9 series aircraft. NOTE: This AD applies to each engine identified in the preceeding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (f) to rquest approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition, or different action necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any engine from the applicability of this AD. Compliance: Required as indicated, unless accomplished previously. To prevent CCOC rupture, which can result in an uncontained engine failure and damage to the aircraft, accomplish the following: (a) For engines installed on McDonnell Douglas DC-9 series aircraft, perform the following: (1) Perform a borescope inspection of the CCOC for cracking within 1,000 cycles in service (CIS) after the effective date of this airworthiness directive (AD), in accordance with Section 2.A of PW Alert Service Bulletin (ASB) No. A6202, dated February 20, 1995. (2) Remove from service CCOC's that exhibit cracking in accordance with Section 2.A of PW ASB No. A6202, dated February 20, 1995. (b) For engines installed on Boeing 737 series aircraft, perform the following: (1) Perform a borescope inspection of the CCOC for cracking within 1,500 CIS after the effective date of this AD, in accordance with Section 2.A of PW ASB No. A6202, dated February 20, 1995. (2) Remove from service CCOC's that exhibit cracking in accordance with section 2.A of PW ASB No. A6202, dated February 20, 1995. (c) At every accessibility of the CCOC after the effective date of this AD, perform the following: (1) Prior to reassembly of the outer split fan ducts, perform an ultrasonic inspection for cracking in accordance with Section 2.B of PW ASB No. A6202, dated February 20, 1995. (2) Remove from service CCOC's that exhibit cracking in accordance with Section 2.B of PW ASB No. A6202, dated February 20, 1995. (d) Compliance with paragraph (c) of this AD is an acceptable alternative to performing the borescope inspection required by paragraph (a) or (b) of this AD, as applicable. (e) For the purpose of this AD, accessibility of the CCOC is defined as separation of the "J" and "K" flanges and removal of the outer split fan ducts. (f) 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, Engine Certification Office. The request should be forwarded through an appropriate FAA Prinicpal Maintenance Inspector, who may add comments and then send it the Manager, Engine Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (g) Special flight permits may be issued in accordance with 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the requirements of this AD can be accomplished. (h) The inspections of the CCOC shall be done in accordance with the following service document: Document No. Pages Date PW ASB No. 6202 1-11 February 20,
1995 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 Pratt & Whitney, 400 Main St., East Hartford, CT 06108. Copies may be inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (i) This amendment becomes effective on May 9, 1995. FOR FURTHER INFORMATION CONTACT: Mark A. Rumizen, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803-5299; telephone (617) 238-7137, fax (617) 238-7199.
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