96-25-10: Design Turbine Exhaust Case

96-25-10 Pratt & Whitney: Amendment 39-9853. Docket 95-ANE-57. Applicability: Pratt & Whitney (PW) JT9D-3, -7, -20, -59A, -70A, -7Q, and -7R4 series turbofan engines, installed on but not limited to Airbus A300 and A310 series; Boeing 747 and 767 series; and McDonnell Douglas DC-10 series aircraft. Note 1: This airworthiness directive (AD) applies to each engine 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 engines 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 (b) 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. Compliance: Required as indicated, unless accomplished previously. To prevent release of uncontained debris from the turbine exhaust case (TEC) following an internal engine failure, which can result in damage to the aircraft, accomplish the following: (a) At the next removal of the TEC from the low pressure turbine case "P" flange for overhaul, where the No. 4 bearing, carbon seals, lubrication pressurization lines, or scavenge lines are removed for maintenance after the effective date of this AD, but not later than 48 months after the effective date of this AD, accomplish the following: (1) For PW JT9D-3A, -7, -7A, -7AH, -7H, -7F, -7J, -20, and -20J series turbofan engines, accomplish any one of the following actions: (i) Install a thicker-walled TEC, with Part Numbers (P/N's) listed in PW SB No. 6113, dated April 13, 1993, as applicable; or (ii) Install a modified TEC that incorporates a containment shield, with P/N's listed in PW SB No. 5907, dated March 27, 1990, as applicable; or (iii) Install a modified TEC that incorporates a replacement "P" flange and case wall, with P/N's listed in PW SB No. 6118, Revision 3, dated January 10, 1996, or (iv) Install a modified TEC that incorporates a replacement "P" flange and case wall, with Chromalloy Supplemental Type Certificate (STC) SE00047AT-D, dated October 15, 1996. (2) For PW JT9D-7Q and -7Q3 series turbofan engines, accomplish any one of the following actions: (i) Install a thicker-walled TEC, with P/N's listed in PW SB No. 5977, dated December 14, 1990; or (ii) Install a modified TEC that incorporates a containment shield, with P/N's listed in PW SB No. 5907, dated March 27, 1990, as applicable; or (iii) Install a modified TEC that incorporates a replacement "P" flange and case wall, with P/N's listed in PW SB No. 6157, Revision 1, dated July 17, 1996; or (iv) Install a modified TEC that incorporates a replacement "P" flange and case wall, with Chromalloy STC SE00047AT-D, dated October 15, 1996. (3) For PW JT9D-59A and -70A series turbofan engines, accomplish one of the following actions: (i) Install a thicker-walled TEC, with P/N's listed in PW SB No. 6243, dated February 1, 1996; or (ii) Install a modified TEC that incorporates a containment shield, with P/N's listed in PW SB No. 5907, dated March 27, 1990, as applicable; (iii) Install a modified TEC that incorporates a replacement "P" flange and case wall, with P/N's listed in PW SB No. 6157, Revision 1, dated July 17, 1996; or (iv) Install a modified TEC that incorporates a replacement "P" flange and case wall, with Chromalloy STC SE00047AT-D, dated October 15, 1996. (4) For PW JT9D-7R4D (BG-700 series) turbofan engines, accomplish one of the following actions: (i) Install a thicker-walled TEC, with P/N's listed in PW SB No. JT9D-7R4-72- 479, Revision 1, dated November 12, 1993; or(ii) Install a modified TEC that incorporates a containment shield, with P/N's listed in PW SB No. JT9D-7R4-72-407, Revision 1, dated August 16, 1990, as applicable; or (iii) Install a modified TEC that incorporates a replacement "P" flange and case wall, with Chromalloy STC SE00047AT-D, dated October 15, 1996. (5) For PW JT9D-7R4D (BG-800 series), -7R4D (BG-900 series), -7R4D1 (AI-500 series), -7R4E (BG-800 series), -7R4E (BG-900 series), -7R4E1 (AI-500 series), -7R4E1 (AI-600 series), -7R4E4 (BG-900 series), -7R4G2 (BG-300 series), and -7R4H1 (AI-600 series) turbofan engines, accomplish any one of the following actions: (i) Install a thicker-walled TEC, with P/N's listed in PW SB No. JT9D-7R4-72- 534, dated October 18, 1996; or (ii) Install a modified TEC that incorporates a containment shield, with P/N's listed in PW SB No. JT9D-7R4-72-466, Revision 2, dated May 10, 1996; or (iii) Install a modified TEC that incorporates a replacement "P" flange and case wall, with P/N's listed in PW SB No. JT9D-7R4-72-534, dated October 18, 1996; or (iv) Install a modified TEC that incorporates a replacement "P" flange and case wall, with Chromalloy STC SE00054AT-D, dated October 19, 1994. (6) For PW JT9D-7R4D (BG-800 series), -7R4D (BG-900 series), -7R4D1 (AI-500 series), -7R4E (BG-800 series), -7R4E (BG-900 series), -7R4E1 (AI-500 series), -7R4E1 (AI-600 series), -7R4E4 (BG-900 series), -7R4G2 (BG-300 series), and -7R4H1 (AI-600 series) turbofan engines, with TECs that have been modified to incorporate a replacement "P" flange and case wall, in accordance with PW SB No. JT9D-7R4-72-513, Revision 3, dated November 13, 1996, or previous revisions, perform heat treatment of the TECs in accordance with the Accomplishment Instructions of PW SB No. JT9D-7R4-72-534, dated October 18, 1996. (b) 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 Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (c) 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 aircraft to a location where the requirements of this AD can be accomplished. (d) The actions required by this AD shall be done in accordance with the following PW SBs: SB No. 5977 1-6 Original December 14, 1990 Total pages: 6. SB No. JT9D-7R4- 72-479 1 1 November 12, 1993 2,3 Original February 25, 1993 4-6 1 November 12, 1993 Total pages: 6. SB No. 6243 1-6 Original February 1, 1996 Total pages: 6. SB No. JT9D-7R4- 72-513 1-19 3 November 13, 1996 Total pages: 19. SB No. JT9D-7R4- 72-534 1-26 Original October 18, 1996 Total pages: 26. SB No. 5907 1-32 Original March 27, 1990 Total pages: 32. SB No. JT9D-7R4- 72-407 1 1 August 16, 1990 2-5 Original March 30, 1990 6 1 August 16, 1990 7-22 Original March 30, 1990 Total pages: 22. SB No. JT9D-7R4- 72-466 1,2 2 May 10, 1996 3-8 Original January 15, 1993 9-11 1 March 4, 1994 12,13 Original January 15, 1993 14-16 1 March 4, 1994 17,18 Original January 15, 1993 Total pages: 18. SB No. 6118 1 3 January 10, 1996 2-5 2 April 18, 1995 6-32 Original April 15, 1993 33 2 April 18, 1995 34-38 Original April 15, 1993 39 1 May 20, 1993 40 Original April 15, 1993 41-44 1 May 20, 1993 45 3 January 10, 1996 Total pages: 45. SB No. 6157 1 1 July 17, 1996 2-15 Original February 9, 1994 16 1 July 17, 1996 Total pages: 16. 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, Publications Department, Supervisor Technical Publications Distribution, M/S 132-30, 400 Main St., East Hartford, CT 06108; telephone (860) 565-7700, fax (860) 565-4503. 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. (e) This amendment becomes effective on February 18, 1997.